Aux AC Error Codes Troubleshooting Guide

Aux AC Error Codes Troubleshooting Guide

In this blog, I am going to provide a comprehensive guide on Aux AC error codes. As the summer season approaches, air conditioning units become an essential part of our daily lives. However, just like any other electronic device, air conditioners can also encounter errors and malfunctions.

By reading this blog, you will learn about different error codes that can appear on your Aux Air Conditioner, their meanings, and the troubleshooting steps to fix them.

 

Aux AC Error Codes List

ERROR CODE (display board) ERROR CODE (wired controller) DESCRIPTION
L1 C1 The fault with the over-electric current protection
L3 C3 The fault with the compressor The power supply Phase deficiency protection
L4 C4 The fault with the inverter module protection (IPM)
E1 E1 The fault with the room temperature sensor (Tico) on the indoor unit
E2 E2 The fault with the temperature sensor (Ticm) on the outdoor unit
E3 E3 The fault with the temperature sensor (Ticm) on the indoor unit
E4 E4 The fault with the fan motor of the indoor unit
E5 E5 Communication error between the outdoor unit and the indoor unit
E8 E8 Communication error between the display board and PCB of the indoor unit
F0 F0 The fault with the fan motor of the outdoor unit
F1 F1 The fault with the inverter module protection on the outdoor unit
F3 F3 The fault with the compressor starts
F4 F4 the fault with the discharge temperature sensor
F6 F6 The fault with the Environ temperature sensor (Tao) on the outdoor unit
F7 F7 The fault with the over-voltage or low-voltage protection
F8 F8 Communication error between the driver PCB and the main PCB of the outdoor unit
F9 F9 The fault with the outdoor unit EPROM
H1 H1 The fault with the drainage
H2 H2 Communication error between the wired controller and the main PCB of the indoor unit
H5 H5 the fault with the low-temperature discharge temperature sensor AUX DC Inverter Free Match 50HZ R32
H6 H6 the fault with the low-pressure switch
H7 H7 the fault with the low pressure
H8 H8 the fault of the four-way valve
P2 J2 the fault with the High-pressure switch
P5 J5 Protection high-temperature discharge
P6 J6 The fault with anti-high-temperature protection of the indoor unit in the heating mode
P7 J7 The fault with the anti-Frozen protection of the indoor unit in the heating mode

 

 

 

Aux Commercial Floor Standing AC Error Codes

The fault The fault Code definition Possible cause Solution
Code
1. The outdoor unit is the power off 1. Turn on the power for the outdoor unit
Communication the fault 2. The communication wire of units lost 2. Reconnect firmly
F1 3. Insert the wrong plug into the indoor or the outdoor unit control board 3. Loosen and insert the right plug
between the indoor unit and
4. The communication wire is an open or short circuit 4. Replace a normal communication wire
the outdoor unit
5. The indoor unit control board malfunction 5. Replace the control board
6. The outdoor unit control board malfunction 6. Replace the control board
Input the power supply phase 1. Phase loss 1. Reconnect the wires firmly
E6 2. Low-voltage 2. Check if the power supply is consistent with the
sequence protection
3. Phase dislocation nameplate
(The outdoor unit)
3. Exchange the two-phase sequence of the power supply
1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E1 The indoor ambient temperature 2. Sensor plug insert again 2. Reinsert
sensor the fault 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
F3 the outdoor the fan protection 1. The outdoor unit ventilation insufficient 1. Improve or enhance the ventilation
2. The fan motor stuck 2. Replace the fan motor
1. the outdoor fan blade broken 1. Replace the fan blade
2. the connection between the fan blade and the outdoor the fan motor 2. Tighten or replace the sleeve
loose
3. the outdoor fan stops working 3. Eliminate the malfunction cause
F2 Discharge temperature 4. the outdoor ventilation insufficient 4. Improve or enhance the ventilation
protection 5. the outdoor exchanger is dirty or sticky 5. Clean the heat exchanger
6. discharge temperature sensor deviation 6. Replace the sensor
7. Refrigerant leak 7. Find out the leak point, repair the welding, refill the freon unit
after vacuuming it
8. The capillary or the filter is blocked 8. Replace the capillary or filter
1. the globe valve is closed 1. Open the globe valve
2. the outdoor fan blade broken 2. Replace the fan blade
3. the connection between the fan blade and the outdoor the fan motor 3. tighten or replace the sleeve
EH High-pressure protection loose
4. the outdoor fan stops working 4. Eliminate the malfunction cause
5. the outdoor ventilation insufficient 5. Improve or enhance the ventilation
6. the connection between the high-pressure switch and the control board 6. Reconnect the wire to the control board
loose

 

7. High-pressure switch malfunction 7. Replace the high-pressure switch
8. the outdoor exchanger is dirty or sticky 8. Clean the heat exchanger
9. there are some moistures in the refrigerant line 9. Refill the freon unit after vacuuming it
10. The capillary or the filter is blocked 10. Replace the capillary or filter
1. the globe valve is closed 1. open the globe valve
2. the indoor fan blade broken 2. tighten or replace the sleeve
3. the connection between the fan blade and the indoor the fan motor 3. the indoor fan blade broken
loose
4. the outdoor fan stops working 4. Eliminate the malfunction cause
EL Low-pressure protection 5. filter net is dirty 5. Clean the filter
6. Refrigerant leak 6. Find out the leak point, repair the welding, refill the freon unit
after vacuuming it
7. the connection between the low-pressure switch and the control board 7. Reconnect the wire to the control board
loose
8. Low-pressure switch malfunction 8. Replace the low-pressure switch
9. The capillary or the filter is blocked 9. Replace the capillary or filter
1. Refrigerant leak 1. Find out the leak point, repair the welding, refill the freon
E0 Refrigerant lack protection/4- unit after vacuuming it
2. 4-way valve coil open or short circuit 2. Replace the 4-way valve coil
way valve the fault protection
3. Valve block cannot get the designated position or Valve blow- 3. Replace the 4-way valve
by
1. Sensor separates from the coil 1. Refix the sensor correctly
E3 The indoor coil temperature sensor 2. Sensor plug insert again 2. Reinsert
the fault (TE) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separates from the coil 1. Refix the sensor correctly
E2 The outdoor coil temperature sensor 2. Sensor plug insert again 2. Reinsert
the fault (TW) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
1. sensor separate from the copper tube 1. Refix the sensor correctly
E8 Discharge temperature (TP) 2. Sensor plug insert again 2. Reinsert
sensor the fault 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
E9 Electric heating protection 1.  Electric heater is an open or short circuit 1.  Replace a normal one
2.  The blower malfunction 2.  Replace a normal one

 

 

 

 

Aux Duct Type AC Error Codes

The fault The fault code definition Possible cause Solution
code
1.  The connection loose 1.  reconnect firmly
E5 Wired controller 2.  Wired controller malfunction 2.  replace a new one
3.  The communication wire is an open or short circuit 3.  replace a normal one
communication the fault
4.  The indoor unit control board malfunction 4. replace a new one
1.  Drain pipe is blocked 1.  Clean the drain pipe
E4 2.  Float switch short-circuit or unconnected 2.  Rapace float switch or reconnect it
Drainage system the fault 3.  The power line of the water pump lose 3.  Reconnect the power line of the water pump
4.  The water pump is broken 4. Replace the water pump
5. The indoor PCB is broken 5. Replace PCB
1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E1 The indoor ambient temperature 2. Sensor plug insert again 2. Reinsert
sensor the fault 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separated from the coil 1. Refix the sensor correctly
E3 The indoor coil temperature sensor 2. Sensor plug insert again 2. Reinsert
the fault (TE) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separated from the coil 1. Refix the sensor correctly
E2 The outdoor coil temperature sensor 2. Sensor plug insert again 2. Reinsert
the fault (TW) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E7 The outdoor ambient temperature 2. Sensor plug insert again 2. Reinsert
the sensor with the fault (TL) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
1. Refrigerant leak 1. Find out the leak point, repair the welding, refill
E0 Refrigerant lack protection/4-way the unit after vacuuming it
valve the fault protection 2. 4-way valve coil open or short circuit 2. Replace the 4-way valve coil
3. Valve block cannot get the designated position or Valve blow-by 3. Replace the 4-way valve

 

1. The outdoor unit is the power off 1. Turn on the power for the outdoor unit
Communication the fault 2. The communication wire of units lost 2. Reconnect firmly
F1 3. Insert the wrong plug into the indoor or the outdoor unit control board 3. Loosen and insert the right plug
between the indoor unit and
the outdoor unit 4. The communication wire is an open or short circuit 4. Replace a normal communication wire
5. The indoor unit control board malfunction 5. Replace the control board
6. The outdoor unit control board malfunction 6. Replace the control board
1. The connection loose 1. Reconnect firmly
E5 Wired controller 2. Wired controller malfunction 2. Replace a new one
communication the fault 3. The communication wire is an open or short circuit 3. Replace a normal one
4. The indoor unit control board malfunction 4. Replace a new one
1. Drain pipe is blocked 1. Clean the drain pipe
E4 2. Float switch short-circuit or unconnected 2. Repace the float switch or reconnect it
Drainage system the fault 3. The power line of the water pump loose 3. Reconnect the power line of the water pump
4. The water pump is broken 4. Replace the water pump
5. The indoor PCB is broken 5. Replace PCB
Input the power supply phase 1. Phase loss 1. Reconnect the wires firmly
E6 2. Low-voltage 2. Check if the power supply is consistent with the
sequence protection nameplate
(The outdoor unit) 3. Phase dislocation 3. Exchange the two-phase sequence of the power
supply
1. the outdoor fan blade broken 1. Replace the fan blade
2. the connection between the fan blade and the outdoor the fan motor 2. Tighten or replace the sleeve
loose
3. the outdoor fan stops working 3. Eliminate the malfunction cause
EA Discharge temperature 4. the outdoor ventilation insufficient 4. Improve or enhance the ventilation
protection 5. the outdoor exchanger is dirty or sticky 5. Clean the heat exchanger
6. discharge temperature sensor deviation 6. Replace the sensor
7. Refrigerant leak 7. Find out the leak point, repair the welding, refill the freon
unit after vacuuming it
8. The capillary or the filter is blocked 8. Replace the capillary or filter
E9 High-pressure protection 1. the globe valve is closed 1. Open the globe valve
2. the outdoor fan blade broken 2. Replace the fan blade

 

3. the connection between the fan blade and the outdoor the fan motor 3. tighten or replace the sleeve
loose
4. the outdoor fan stops working 4. Eliminate the malfunction cause
5. the outdoor ventilation insufficient 5. Improve or enhance the ventilation
6. the connection between the high-pressure switch and the control 6. Reconnect the wire to the control board
board loose
7. High-pressure switch malfunction 7. Replace the high-pressure switch
8. the outdoor exchanger is dirty or sticky 8. Clean the heat exchanger
9. there are some moistures in the refrigerant line 9. Refill the freon unit after vacuuming it
10. The capillary or the filter is blocked 10. Replace the capillary or filter
1. The globe valve is closed 1. Open the globe valve
2. The indoor fan blade broken 2. Tighten or replace the sleeve
3. The connection between the fan blade and the indoor the fan motor 3. The indoor fan blade broken
loose
4. The outdoor fan stops working 4. Eliminate the malfunction cause
E9 Low-pressure protection 5. Filter net is dirty 5. Clean the filter
6. Refrigerant leak 6. Find out the leak point, repair the welding, refill the freon
unit after vacuuming it
7. The connection between the low-pressure switch and the control 7. Reconnect the wire to the control board
board loose
8. Low-pressure switch malfunction 8. Replace the low-pressure switch
9. The capillary or the filter is blocked 9. Replace the capillary or filter
1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E1 The indoor ambient temperature 2. Sensor plug insert again 2. Reinsert
sensor the fault 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separated from the coil 1. Refix the sensor correctly
E3 The indoor coil temperature sensor 2. Sensor plug insert again 2. Reinsert
the fault (TE) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separated from the coil 1. Refix the sensor correctly
E2 The outdoor coil temperature 2. Sensor plug insert again 2. Reinsert
sensor the fault (TW) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
The outdoor ambient 1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E7 2. Sensor plug insert again 2. Reinsert
temperature. Sensor
3. Sensor is an open or short circuit 3. Replace the sensor
abnormal (TL)
4. the outdoor unit control board malfunction 4. Replace the outdoor unit control board
E8 Discharge temperature 1. sensor separated from the copper tube 1. Refix the sensor correctly
(Spenser the fault 2. Sensor plug insert again 2. Reinsert

 

3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
1. Refrigerant leak 1. Find out the leak point, repair the welding, refill the freon
E11 Refrigerant lack protection/4- unit after vacuuming it
2. 4-way valve coil open or short circuit 2. Replace the 4-way valve coil
way valve the fault protection
3. Valve block cannot get the designated position or Valve blow- 3. Replace the 4-way valve
by

 

 

 

 

 

 

Aux King Kong type Chiller AC Error Codes

Models: ACMK-H65/5, ACMK-H130/5

The fault The fault code definition possible cause Solution
code
1. The water flow switch and the power supply wires are not well connected 1. reconnect the wires firmly
2. The water flow switch malfunction 2. Replace a normal water flow switch
E01 The water flow switch protection 3. Circulating the water pump malfunction 3. Repair or replace the circulating the water pump
4. The water filter clogging 4. Clean or replace the water filter
5. The evaporator tubes have a dirty plugging phenomenon 5. Clean the evaporator tubes
E05 The power supply phase sequence 1. Phase loss 1. reconnect the wires firmly
protection 2. Phase dislocation 2. change the two-phase sequence of the power supply
Return the water temperature 1. The temperature sensor broken 1. Replace the sensor
E07 2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
sensor the fault
3. Main control board malfunction 3. Replace the main control board
The water outlet temperature sensor 1. The temperature sensor broken 1. Replace the sensor
E08 2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
the fault
3. Main control board malfunction 3. Replace the main control board
The outdoor   ambient   temperature 1. The temperature sensor broken 1. Replace the sensor
E09 2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
sensor the fault 3. Main control board malfunction 3. Replace the main control board
1. The temperature sensor broken 1.  Replace the temperature sensor
E12 Anti-hyperthermal protection 2. Circulating the water pump malfunction 2. Repair or replace the circulating the water pump
in heating mode 3. The water filter clogging 3.  Clean or replace the water filter
4. The evaporator tubes have a dirty plugging phenomenon 4. Clean the evaporator tubes
The water flow shortage protection 1. The return of the water temperature or the water inlet sensor broken 1.  Replace the temperature sensor
2. The water filter clogging 2. Clean or replace the water filter
E13 (Chilled the water big temperature
3. Circulating the water pump malfunction 3.  Repair or replace the circulating the water pump
difference)
4. The evaporator tubes have a dirty plugging phenomenon 4. Clean the evaporator tubes
1. The connection plug loose 1. reconnect firmly
E15 Communication the fault between 2. Wired controller malfunction 2. replace a new one
wired controller and PCB 3. The communication wire is an open or short circuit 3. replace a normal one
4. Main control board malfunction 4. replace a new one
1. The connection plug loose 1. reconnect firmly
Communication the fault between 2. The communication wire between modules is a short circuit 2. replace a new one
E30 or open circuit
different modules
3. The communication wire is an open or short circuit 3. replace a normal one
4. Main control board malfunction 4. replace a new one

 

E18 Subsystem1#highpressure 1. the outdoor ventilation insufficient 1. Improve or enhance the ventilation
protection 2. the outdoor fan blade broken 2. Replace the fan blade
3. the connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
E19 Subsystem 2#high pressure motor loose
protection 4. the outdoor fan stops working 4. Eliminate the malfunction cause
5. the connection between the high-pressure switch and the main 5. Reconnect the wire plug to the main control board
Subsystem 3#high pressure
E20 control board lose
protection 6. High-pressure switch malfunction 6. Replace the high-pressure switch
7. the outdoor exchanger is dirty or sticky 7. Clean the heat exchanger
Subsystem 4#high pressure
E21 8. there are some airs in the refrigerant line 8. Refill the freon unit after vacuuming it
protection 9. The capillary or the filter is blocked 9. Replace the capillary or filter
E22 Subsystem 1#low pressure 1. Circulating the water pump malfunction 1. Repair it or change a normal one
2. Clean the water filter
protection 2. The water filter clogging
3. Clean the evaporator tubes
E23 Subsystem 2#low pressure 3. The evaporator tubes have a dirty plugging phenomenon
4. The connection between the low-pressure switch and the main
protection 4. Reconnect the wire to the main control board
control board lose
Subsystem 3#low pressure
E24 5. Low-pressure switch malfunction 5. Replace the low-pressure switch
protection 6. Refrigerant leak
6. Find out the leak point, repair the welding, refill the freon unit
Subsystem 4#low pressure
E25 7. The capillary or the filter is blocked after vacuuming it
protection
7. Replace the capillary or filter
Subsystem 1# air discharge 1. the outdoor ventilation insufficient 1. Improve or enhance the ventilation
2. the outdoor fan blade broken 2. Replace the fan blade
E26 temperature overhigh
protection 3. the connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
motor loose
Subsystem 2# air discharge
E27 4. the outdoor fan stops working 4. Eliminate the malfunction cause
temperature overhigh 5. the connection between the discharge temperature sensor 5. Reconnect the wire plug to the main control board
protection
and the main control board lose
Subsystem 3# air discharge 6. the outdoor exchanger is dirty or sticky 6. Clean the heat exchanger
7. discharge temperature sensor deviation 7. Replace the sensor
E28 temperature overhigh
8. Refrigerant leak 8. Find out the leak point, repair the welding, refill the freon unit
protection
after vacuuming it
Subsystem 4# air discharge 9. The indoor capillary or the filter is blocked
9. Replace the capillary or filter
E29 temperature overhigh 10. there are some airs in the refrigerant line 10. Find out the leak point, repair the welding, refill the freon
protection unit after vacuuming it
1. the water outlet temperature sensor malfunction 1. Replace a normal one
2. Circulating the water pump malfunction 2. Repair it or change a normal one
E33 Anti-freezing protection in 3. The water filter clogging 3. Clean the water filter
cooling mode 4. The evaporator tubes have a dirty plugging phenomenon 4. Clean the evaporator tubes
5. Refrigerant leak 5. Find out the leak point, repair the welding, refill the freon unit
after vacuuming it

 

E34 Subsystem 1# the compressor 1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
overcurrent protection 2. Tighten or replace the sleeve
2. The connection between the fan blade and the outdoor the fan
Subsystem 2# the compressor
E35 motor loose 3. Eliminate the malfunction cause
overcurrent protection 3. the outdoor fan stops working
4. Replace the fan blade
4. The outdoor fan blade broken
Subsystem 3# the compressor
E36 5. Clean the heat exchanger
5. The outdoor exchanger is dirty or sticky
overcurrent protection 6. Replace the capillary or filter
6. Pipeline ice blocking or dirty
Subsystem 4# the compressor 7. Release some refrigerant
E37 7. Refrigerant overcharged
overcurrent protection
E38 Subsystem 1# 4-way valve the fault 1. 4-way valve coil open or short circuit 1. Replace valve coil
2. Valve block cannot get the designated position or Valve 2. Replace valve body
E39 Subsystem 2# 4-way valve the fault
blow-by
E40 Subsystem 3# 4-way valve the fault 3. The outdoor ambient temperature sensor or exchanger coil 3. Replace a normal one
temperature sensor malfunction
E41 Subsystem 4# 4-way valve the fault
4. The main PCB failure 4. Replace the main PCB board
E42 Subsystem 1# discharge
temperature sensor the fault
E43 Subsystem 2# discharge 1. Sensor is an open or short circuit 1. Replace the sensor
temperature sensor the fault
2. Sensor plug insert again 2. Reinsert firmly
Subsystem 3# discharge
E44 3. Main control board malfunction 3. Replace the main control board
temperature sensor the fault
E45 Subsystem 4# discharge
temperature sensor the fault
E46 Subsystem 1# exchanger coil
temperature sensor the fault
E47 Subsystem 2# exchanger coil 1. Sensor is an open or short circuit 1. Replace the sensor
temperature sensor the fault
2. Sensor plug insert again 2. Reinsert firmly
Subsystem 3# exchanger coil
E48 3. Main control board malfunction 3. Replace the main control board
temperature sensor the fault
E49 Subsystem 4# exchanger coil
temperature sensor the fault
E53 Module type dip switch setting Module type dip switch setting incorrect Reset the Module type dip switch setting concerning the
incorrect wiring diagram
E54 Module address repeat Module address dip switch setting incorrect reset address setting dip switch concerning wiring
diagram as needed

 

 

 

Aux X type Chiller AC Error Codes

Models: ACMX-H65/5, ACMX-H95/5, ACMX-H130/5, ACMX-H65/5R1

the fault code the fault code definition possible cause Solution
1 、 The water flow switch and the power supply wires are not well 1. reconnect the wires firmly
connected 2. Replace a normal water flow switch
E01 2. The water flow switch malfunction
The water flow switch protection 3. Repair or replace the circulating the water pump
3. Circulating the water pump malfunction
4. Clean or replace the water filter
4. The water filter clogging
5. Clean the evaporator tubes
5. The evaporator tubes have a dirty plugging phenomenon
E03 The outdoor fan NO1.  &NO3. overload 1. The outdoor unit ventilation insufficient 1. Improve or enhance the ventilation
protection
E04 The outdoor fan NO2.  overload protection 2. The fan motor stuck 2. Replace the fan motor
E05 Input the power supply phase sequence 1. Phase loss 1. reconnect the wires firmly
protection 2. Phase dislocation 2. change the two-phase sequence of the power supply
E07 Return the water temperature to the fault 1. The temperature sensor broken 1. Replace the sensor
2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
3. Main control board malfunction 3. Replace the main control board
E08 The water outlet temperature is the fault 1. The temperature sensor broken 1. Replace the sensor
2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
3. Main control board malfunction 3. Replace the main control board
1. The temperature sensor broken 1.  Replace the temperature sensor
2. Repair or replace the circulating the water pump
E12 Anti-hyperthermal protection 2. Circulating the water pump malfunction
3.  Clean or replace the water filter
in heating mode 3. The water filter clogging
4. Clean the evaporator tubes
4. The evaporator tubes have a dirty plugging phenomenon
1 The return of the water temperature or the water inlet sensor 1.  Replace the temperature sensor
The water flow shortage protection broken 2. Clean or replace the water filter
E13 2. The water filter clogging 3.  Repair or replace the circulating the water pump
(Chilled the water big temperature difference)
3. Circulating the water pump malfunction 4. Clean the evaporator tubes
4. The evaporator tubes have a dirty plugging phenomenon
1. The connection plug loose 1. Reconnect firmly
E15 Communication the fault between wired 2. Wired controller malfunction 2. Replace a new one
controller and PCB 3. The communication wire is an open or short circuit 3. Replace a normal one
4. Main control board malfunction 4. Replace a new one
E16 Circulating the water anti-freezing protection 1.  The outdoor ambient temperature is too low 1. Start the heating mode
in winter 2. The outdoor ambient temperature sensor malfunction 2. Replace The outdoor ambient temperature sensor

 

1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
E26 High discharge temperature protection of 2. The outdoor fan blade broken 2. Replace the fan blade
the compressor 1# 3. The connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
motor loose
4. The outdoor fan stops working 4. Eliminate the malfunction cause
5. The connection between the discharge temperature sensor 5. Reconnect the wire plug to the main control board
E27 High discharge temperature protection of and the main control board lose
the compressor 2# 6. The outdoor exchanger is dirty or sticky 6. Clean the heat exchanger
7. Discharge temperature sensor deviation 7. Replace the sensor
8. Refrigerant leak 8. Find out the leak point, repair the welding, refill
High discharge temperature protection of unit after vacuuming it
E28 9. The indoor capillary or the filter is blocked 9. Replace the capillary or filter
the compressor 3# 10. There are some airs in the refrigerant line 10. Find out the leak point, repair the welding, refill
the unit after vacuuming it
1. The connection plug loose 1. Reconnect firmly
E30 Communication the fault between different 2. The communication wire between modules is short 2. Replace a new one
circuit or open circuit
modules
3. The communication wire is an open or short circuit 3. Replace a normal one
4. Main control board malfunction 4. Replace a new one
1. The water outlet temperature sensor malfunction 1. Replace a normal one
2. Repair it or change a normal one
2. Circulating the water pump malfunction
E33 3. Clean the water filter
Anti-freezing protection in cooling mode 3. The water filter clogging
4. Clean the evaporator tubes
4. The evaporator tubes have a dirty plugging phenomenon
5. Refrigerant leak 5. Find out the leak point, repair the welding, refill the freon
unit after vacuuming it
E34 Over-current protection of the compressor 1# 1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
2. Tighten or replace the sleeve
2. The connection between the fan blade and the outdoor the fan
motor loose 3. Eliminate the malfunction cause
3. The outdoor fan stops working
E35 Over-current protection of the compressor 2# 4. Replace the fan blade
4. The outdoor fan blade broken
5. The outdoor exchanger is dirty or sticky 5. Clean the heat exchanger
6. Replace the capillary or filter
6. Pipeline ice blocking or dirty
E36 Over-current protection of the compressor 3# 7. Release some refrigerant
7. Refrigerant overcharged
1. 4-way valve coil open or short circuit 1. Replace valve coil
2. Valve block cannot get the designated position or Valve 2. Replace valve body
E38 The four-way valve malfunction blow-by
3. The outdoor ambient temperature sensor malfunction or 3. Replace a normal one
exchanger coil temperature sensor
4. The main PCB failure 4. Replace the main PCB board

 

1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
2. The outdoor fan blade broken 2. Replace the fan blade
3. The connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
motor loose
E39 4. The outdoor fan stops working 4. Eliminate the malfunction cause
High-pressure protection 5. The connection between the high-pressure switch and the main 5. Reconnect the wire plug to the main control board
control board lose
6. High-pressure switch malfunction 6. Replace the high-pressure switch
7. The outdoor exchanger is dirty or sticky 7. Clean the heat exchanger
8. There are some airs in the refrigerant line 8. Refill the freon unit after vacuuming it
9. The capillary or the filter is blocked 9. Replace the capillary or filter
1. Circulating the water pump malfunction 1. Repair it or change a normal one
2. The water filter clogging 2. Clean the water filter
3. The evaporator tubes have a dirty plugging phenomenon 3. Clean the evaporator tubes
E40 Low-pressure protection 4. The connection between the low-pressure switch and the main 4. Reconnect the wire to the main control board
control board lose
5. Low-pressure switch malfunction 5. Replace the low-pressure switch
6. Refrigerant leak 6. Find out the leak point, repair the welding, refill the freon
unit after vacuuming it
7. The capillary or the filter is blocked 7. Replace the capillary or filter
1. Sensor is an open or short circuit 1. Replace the sensor
E41 Exchanger coil bottom temperature 2. Sensor separates from the copper tube 2. Refix the sensor correctly
sensor the fault 3. Sensor plug insert again 3. Reinsert firmly
4. Main control board malfunction 4. Replace the main control board
E42 Discharge temperature sensor the fault of 1. Sensor is an open or short circuit 1. Replace the sensor
the compressor 1#
2. Sensor separates from the copper tube 2. Refix the sensor correctly
E43 Discharge temperature sensor the fault of
the compressor 2# 3. Sensor plug insert again 3. Reinsert firmly
E44 Discharge temperature sensor the fault of 4. Main control board malfunction 4. Replace the main control board
the compressor 3#
1. Sensor is an open or short circuit 1. Replace the sensor
E50 Suction temperature sensor the fault 2. Sensor separates from the copper tube 2. Refix the sensor correctly
3. Sensor plug insert again 3. Reinsert firmly
4. Main control board malfunction 4. Replace the main control board
1. Sensor is an open or short circuit 1. Replace the sensor
E51 Evaporator temperature sensor the fault 2. Sensor separates from the copper tube 2. Refix the sensor correctly
3. Sensor plug insert again 3. Reinsert firmly
4. Main control board malfunction 4. Replace the main control board
E52 1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
Cooling overload protection 2. Replace the fan blade
2. The outdoor fan blade broken
3. Tighten or replace the sleeve

 

3. The connection between the fan blade and the outdoor the fan 4. Eliminate the malfunction cause
motor loose
4. The outdoor fan stops working 5. Replace the sensor
5. Exchanger coil bottom temperature sensor malfunction 6. Clean the heat exchanger
6. The outdoor exchanger is dirty or sticky 7. Refill the freon unit after vacuuming it
7.  There are some airs in the refrigerant line 8. Replace the capillary or filter
8. The capillary or the filter is blocked
E53 Module type dip switch setting incorrect Module type dip switch setting incorrect Reset Module type dip switch setting with reference
to the wiring diagram
E54 Module address repeat Module address dip switch setting incorrect Reset address setting dip switch concerning
wiring diagram as needed

 

 

 

Aux Mini Chiller AC Error Codes

Models: ACMI-H12/4, ACMI-H16/5, ACMI-H28/5, ACMI-H42/5

The fault The fault code definition Possible cause solution
code
1. The connection plug loose 1. Reconnect firmly
Eon 00 Communication the fault 2. The communication wire is an open or short circuit 2. Replace a normal one
3. Main control board malfunction 3. Replace a new one
1 、 The water flow switch and the power supply wires are not well 1. reconnect the wires firmly
connected
Eon 01 The water flow switch protection 2. The water flow switch malfunction 2. Replace a normal water flow switch
3. Circulating the water pump malfunction 3. Repair or replace the circulating the water pump
4. The water filter clogging 4. Clean or replace the water filter
5. The evaporator tubes have a dirty plugging phenomenon 5. Clean the evaporator tubes
Eo:02 The outdoor the fan motor overload 1. The outdoor unit ventilation insufficient 1. Improve or enhance the ventilation
2. The fan motor stuck 2. Replace the fan motor
Eo:03 Input the power supply phase sequence 1. Phase loss 1. reconnect the wires firmly
protection 2. Phase dislocation 2. change the two-phase sequence of the power supply
1 The return of the water temperature or the water inlet sensor 1.  Replace the temperature sensor
The water flow shortage protection broken 2. Clean or replace the water filter
Eo:04 2. The water filter clogging 3.  Repair or replace the circulating the water pump
(Chilled the water big temperature difference)
3. Circulating the water pump malfunction 4. Clean the evaporator tubes
4. The evaporator tubes have a dirty plugging phenomenon
Eo:06 Freezing point protection switch The freezing point protection switch is off Press the reset key to reset
1. The temperature sensor broken 1.  Replace the temperature sensor
Eo:07 Anti-hyperthermal protection 2. Circulating the water pump malfunction 2. Repair or replace the circulating the water pump
in heating mode 3. The water filter clogging 3.  Clean or replace the water filter
4. The evaporator tubes have a dirty plugging phenomenon 4. Clean the evaporator tubes
High discharge temperature protection of 1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
Er:03 2. The outdoor fan blade broken 2. Replace the fan blade
subsystem 1# 3. The connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
motor loose

 

4. The outdoor fan stops working 4. Eliminate the malfunction cause
5 、 The connection between discharge temperature 5. Reconnect the wire plug to the main control board
sensor and main control board lose
High discharge temperature protection of 6. The outdoor exchanger is dirty or sticky 6. Clean the heat exchanger
Er:13 7. Discharge temperature sensor deviation 7. Replace the sensor
subsystem 2# 8. Refrigerant leak 8. Find out the leak point, repair the welding, refill
the unit after vacuuming it
9. The indoor capillary or the filter is blocked 9. Replace the capillary or filter
10. There are some airs in the refrigerant line 10. Find out the leak point, repair the welding, refill
the unit after vacuuming it
1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
2. The outdoor fan blade broken 2. Replace the fan blade
High-pressure protection of subsystem 1# 3. The connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
motor loose
Er 04
4. The outdoor fan stops working 4. Eliminate the malfunction cause
5. The connection between the high-pressure switch and 5. Reconnect the wire plug to the main control board
main control board lose
6. High-pressure switch malfunction 6. Replace the high-pressure switch
Er:14 High-pressure protection of subsystem 2# 7. The outdoor exchanger is dirty or sticky 7. Clean the heat exchanger
8. There are some airs in the refrigerant line 8. Refill the freon unit after vacuuming it
9. The capillary or the filter is blocked 9. Replace the capillary or filter
1. Circulating the water pump malfunction 1. Repair it or change a normal one
Er:05 low suction pressure protection of 2. The water filter clogging 2. Clean the water filter
Subsystem 1# 3. The evaporator tubes have a dirty plugging phenomenon 3. Clean the evaporator tubes
4. The connection between the low-pressure switch and the main 4. Reconnect the wire to the main control board
control board lose
low suction pressure protection of 5. Low-pressure switch malfunction 5. Replace the low-pressure switch
Er:15 6. Refrigerant leak 6. Find out the leak point, repair the welding, refill
Subsystem 2# the unit after vacuuming it
7. The capillary or the filter is blocked 7. Replace the capillary or filter
1. The temperature sensor broken 1. Replace the sensor
01 Return the water temperature to the fault 2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
Po 3. Main control board malfunction 3. Replace the main control board
The outdoor ambient temperature sensor 1. The temperature sensor broken 1. Replace the sensor
02 2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
Po the fault 3. Main control board malfunction 3. Replace the main control board

 

 

1. The water outlet temperature sensor malfunction 1. Replace a normal one
2. Repair it or change a normal one
2. Circulating the water pump malfunction
3. Clean the water filter
03 Anti-freezing protection in cooling mode 3. The water filter clogging
Po 4. The evaporator tubes have a dirty plugging phenomenon 4. Clean the evaporator tubes
5. Refrigerant leak 5. Find out the leak point, repair the welding, refill
the unit after vacuuming it
1. The temperature sensor broken 1. Replace the sensor
06 The water outlet temperature is the fault 2. Sensor plug insert again to PCB 2. Reconnect the sensor firmly
Po 3. Main control board malfunction 3. Replace the main control board
07 Circulating the water anti-freezing protection in The outdoor ambient temperature is too low Start the heating mode
Po winter
Pr:02 Exchanger coil temperature sensor the fault of 1. Sensor is an open or short circuit 1. Replace the sensor
subsystem 1# 2. Sensor separated from the copper tube 2. Refix the sensor correctly
Pr:12 Exchanger coil temperature sensor the fault of 3. Sensor plug insert again 3. Reinsert firmly
subsystem 2# 4. Main control board malfunction 4. Replace the main control board
Pr:03 Discharge temperature sensor the fault of 1. Sensor is an open or short circuit 1. Replace the sensor
subsystem 1# 2. Sensor separates from the copper tube 2. Refix the sensor correctly
Pr:13 Discharge temperature sensor the fault of 3. Sensor plug insert again 3. Reinsert firmly
4. Main control board malfunction 4. Replace the main control board
subsystem 2#
1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
Pr:04 Cooling overload protection of subsystem 2. The outdoor fan blade broken 2. Replace the fan blade
1# 3. The connection between the fan blade and the outdoor the fan 3. Tighten or replace the sleeve
motor loose
4. The outdoor fan stops working 4. Eliminate the malfunction cause
5. Exchanger coil bottom temperature sensor malfunction 5. Replace the sensor
Pr:14 Cooling overload protection of subsystem 6. The outdoor exchanger is dirty or sticky 6. Clean the heat exchanger
2# 7.  There are some airs in the refrigerant line 7. Refill the freon unit after vacuuming it
8. The capillary or the filter is blocked 8. Replace the capillary or filter

 

 

Aux Package AC Error Codes

Models: ART-C50/9, ART-C75/9, ART-C100/9, ART-C125/9, ART-C150/9, ART-C200/9

The fault The fault code definition Possible cause Solution
code
1. The connection loose 1. Reconnect firmly
E5 Wired controller 2. Wired controller malfunction 2. Replace a new one
communication the fault 3. The communication wire is an open or short circuit 3. Replace a normal one
4. The indoor unit control board malfunction 4. Replace a new one
Input the power supply phase 1. Phase loss 1. Reconnect the wires firmly
E6 2. Low-voltage 2. Check if the power supply is consistent with the
sequence protection nameplate
(The outdoor unit) 3. Phase dislocation 3. Exchange the two-phase sequence of the power
supply
1. The outdoor fan blade broken 1. Replace the fan blade
2. The connection between the fan blade and the outdoor the fan motor 2. Tighten or replace the sleeve
loose
3. The outdoor fan stops working 3. Eliminate the malfunction cause
F2 Discharge temperature 4. The outdoor ventilation insufficient 4. Improve or enhance the ventilation
protection 5. The outdoor exchanger is dirty or sticky 5. Clean the heat exchanger
6. Discharge temperature sensor deviation 6. Replace the sensor
7. Refrigerant leak 7. Find out the leak point, repair the welding, refill the freon
unit after vacuuming it
8. The capillary or the filter is blocked 8. Replace the capillary or filter
1. The globe valve is closed 1. Open the globe valve
2. The outdoor fan blade broken 2. Replace the fan blade
3. The connection between the fan blade and the outdoor the fan motor 3. Tighten or replace the sleeve
loose
4. The outdoor fan stops working 4. Eliminate the malfunction cause
EH High-pressure protection 5. The outdoor ventilation insufficient 5. Improve or enhance the ventilation
6. The connection between the high-pressure switch and the control 6. Reconnect the wire to the control board
board loose
7. High-pressure switch malfunction 7. Replace the high-pressure switch
8. The outdoor exchanger is dirty or sticky 8. Clean the heat exchanger
9. There are some moistures in the refrigerant line 9. Refill the freon unit after vacuuming it
10. The capillary or the filter is blocked 10. Replace the capillary or filter
1. The globe valve is closed 1. open the globe valve
EL Low-pressure protection 2. The indoor fan blade broken 2. tighten or replace the sleeve
3. The connection between the fan blade and the indoor the fan motor 3. the indoor fan blade broken
loose

 

4. The outdoor fan stops working 4. Eliminate the malfunction cause
5. Filter net is dirty 5. Clean the filter
6. Refrigerant leak 6. Find out the leak point, repair the welding, refill the freon
unit after vacuuming it
7. The connection between the low-pressure switch and the control board 7. Reconnect the wire to the control board
loose
8. Low-pressure switch malfunction 8. Replace the low-pressure switch
9. The capillary or the filter is blocked 9. Replace the capillary or filter
1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E1 The indoor ambient temperature 2. Sensor plug insert again 2. Reinsert
sensor the fault 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separated from the coil 1. Refix the sensor correctly
E3 The indoor coil temperature sensor 2. Sensor plug insert again 2. Reinsert
the fault (TE) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The indoor unit control board malfunction 4. Replace the indoor unit control board
1. Sensor separated from the coil 1. Refix the sensor correctly
E2 The outdoor coil temperature 2. Sensor plug insert again 2. Reinsert
sensor the fault (TW) 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
1. Sensor separated from the copper tube 1. Refix the sensor correctly
E8 Discharge temperature (TP) 2. Sensor plug insert again 2. Reinsert
sensor the fault 3. Sensor is an open or short circuit 3. Replace the sensor
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board
The outdoor ambient 1. Sensor directly contacts with the heat exchanger 1. Refix the sensor correctly
E7 2. Sensor plug insert again 2. Reinsert
temperature. Sensor
3. Sensor is an open or short circuit 3. Replace the sensor
abnormal (TL)
4. The outdoor unit control board malfunction 4. Replace the outdoor unit control board

 

 

 

Aux Mini ARV AC Error Codes

The fault The fault code definition Possible cause Solution
code
The indoor ambient temperature sensor 1. Temperature sensor broken 1. Replace the sensor
A1 2. Sensor connection is not well connection 2. Reconnect the sensor firmly
the fault
3. The outdoor main control board is broken 3. Replace the outdoor main control board
The middle position of the indoor exchanger 1. Temperature sensor broken 1. Replace the sensor
A2 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
temperature sensor the fault
3. The outdoor main control board is broken 3. Replace the outdoor main control board
The indoor heat exchanger inlet 1. Temperature sensor broken, or exceed test limit 1. Replace the sensor
A3 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
temperature sensor the fault
3. The outdoor main control board is broken 3. Replace the outdoor main control board
The indoor coil pipe outlet temperature 1. Temperature sensor broken, or exceed test limit 1. Replace the sensor
A4 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
sensor failure
3. The outdoor main control board is broken 3. Replace the outdoor main control board
1. Drain pipe is blocked 1. Clean the drain pipe
2. Float switch short-circuit or unconnected 2. Repace the float switch or reconnect it
A5 The indoor unit drainage system the fault 3. The power line of the water pump loose 3. Reconnect the power line of the water pump
4. The water pump is broken 4. Replace the water pump
3. The outdoor main control board is broken 5. Replace PCB
1. The fan motor is an open or short-circuit 1. Replace the fan motor
A6 The indoor PG the fan the fault 2. The connection between the main control board and the fan motor 2. Reconnect firmly
loose.
3. The fan motor gets stuck 3. Replace the fan motor
Reversible synchronous motor 1.  Step motor failure 1. Replace the step motor
A7 2. The connection between the main control board and the fan motor
malfunction 2. Reconnect firmly
loose.
1. EEPROM communication failure
2. EEPROM data validation error (model identification,
A8 The indoor unit EEPROM module failure calibration, etc.) Replace the indoor unit EEPROM module
3. EEPROM data logic errors (superkingdom data range, order,
etc.)
1. The outdoor unit is the power off 1. Turn on the power for the outdoor unit
2. The communication wire plug of units lost 2. Loosen and insert the right plug
The communication the fault between 3. The indoor unit the power off 3. Turn on the power for the indoor unit
A9 4. The communication wire is an open or short circuit 4. Replace a normal communication wire
the indoor unit and the outdoor unit
5. The indoor unit control board malfunction 5. Replace the control board
6. The outdoor unit control board malfunction 6. Replace the control board
7. electromagnetic interference 7. Add electromagnet loop

 

AE Operation mode conflict Some of the indoor unit’s operation mode setting cooling, but some Reset the indoor unit operating mode uniformly
the indoor units’ operation mode setting heating
AH(AB) Two or more of the indoor unit address The indoor unit address setting incorrect Reset the indoor unit address
repeat
1. The blower motor is an open or short circuit 1. Replace the blower motor
2. The blower impeller is broken 2. Replace the blower impeller
AJ The indoor coil anti-freezing protection 3. Sensor directly contacts with the heat exchanger 3 、 Refix the heat exchanger temperature
4. The filter net is too dirty sensor
4. Clean the filter net
1. EXV is blocked 1. Clean the EXV
AF The indoor EXV is the fault 2. The EXV leak 2. Replace the EXV
3. The indoor unit temperature sensor malfunctioned. 3. Replace The indoor unit temperature sensor
4. Evaporator inlet sensor failure. 4. Replace the evaporator inlet sensor
Ambient temperature sensor “Tao” 1. Temperature sensor broken 1. Replace the sensor
C1 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
the fault
3. The outdoor PCB is broken 3. Replace the outdoor main control board
Defrosting temperature sensor 1. Temperature sensor broken 1. Replace the sensor
C2 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
“Tdef1” the fault
3. The outdoor PCB is broken 3. Replace the outdoor main control board
The discharge temperature sensor of 1. Temperature sensor broken 1. Replace the sensor
C3 variable frequency the compressor “Tri” 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
the fault 3. The outdoor PCB is broken 3. Replace the outdoor main control board
The discharge temperature sensor of 1. Temperature sensor broken 1. Replace the sensor
C4 fixed frequency the compressor No.1 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
“Td1” the fault 3. The outdoor PCB is broken 3. Replace the outdoor main control board
The discharge temperature sensor of 1. Temperature sensor broken 1. Replace the sensor
C5 fixed frequency the compressor No.2 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
“Td2” the fault 3. The outdoor PCB is broken 3. Replace the outdoor main control board
Suction pipe temperature sensor of 1. Temperature sensor broken 1. Replace the sensor
C6 fixed frequency of the compressor 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
the compressor “Ts” is the fault 3. The outdoor PCB is broken 3. Replace the outdoor main control board
Suction pipe temperature sensor of 1. Temperature sensor broken 1. Replace the sensor
C7 variable frequency the compressor “Tso” 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
the fault 3. The outdoor PCB is broken 3. Replace the outdoor main control board
The outdoor unit condenser middle 1. Temperature sensor broken 1. Replace the sensor
C8 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
position sensor “Tc” the fault
3. The outdoor PCB is broken 3. Replace the outdoor main control board
Suction pipe temperature sensor of 1. Temperature sensor broken 1. Replace the sensor
C9 variable frequency the compressor “Tso” 2. Sensor connection is incorrect. 2. Reconnect the sensor firmly
the fault 3. The outdoor PCB is broken 3. Replace the outdoor main control board

 

1. 4-way valve coil open or short circuit 1. Replace valve coil
2. Replace valve body
2. Valve block cannot get the designated position or Valve
E1 4-way valve the fault blow-by 3. Reconnect correctly
3. The connection of the 4-way valve and the main PCB incorrect
4. The main PCB failure 4. Replace PCB
1. EXV open degree is small
2. The outdoor exchanger is dirty or sticky
3. The outdoor ventilation insufficient
4. EXV blocked
DC inverter the compressor discharge 5. Refrigerant filter blocked
E3 6. Gas pipe stop valve closed
temperature “Tri” protection
7. Liquid pipe stop valve closed
8. System exhaust sensor the fault
9. System lack refrigerant
10. The outdoor unit PCB the fault
11.  DC inverter the compressor the fault
1. EXV open degree is small
Fixed frequency of the compressor 2. The outdoor exchanger is dirty or sticky
3. The outdoor ventilation insufficient
E4 NO1. discharge temperature “Td1”
4. EXV blocked
protection (shut down)
5. Refrigerant filter blocked
6. Gas pipe stop valve closed
7. Liquid pipe stop valve closed
E5 Fixed frequency of the compressor NO2 8. System exhaust sensor the fault
discharge temperature “Td2” 9. System lack refrigerant
protection (shut down) 10. The outdoor unit PCB the fault
11.  Fixed frequency of the compressor the fault
Limit frequency protection caused by 1. The compressor rotation speed is too high
2. The outdoor ambient temperature is too high
E7 the middle position of the condenser
3. Refrigerant overcharge
Temperature too high
4. The outdoor exchanger is dirty or sticky
1. The outdoor exchanger is dirty or sticky
Condenser middle position 2. The outdoor ambient temperature is too high
3. The pipe from the condenser to the exhaust port block
E8 Temperature sensor “Tc” protection
4. The outdoor unit the fan motor stop or low speed
(Shut down)
5. Refrigerant overcharge
6. Oil temperature is too low
H1(B1) high-pressure protection 1. The outdoor ventilation insufficient 1. Improve or enhance the ventilation
2. The outdoor fan blade broken 2. Replace the fan blade

 

3. The connection between the fan blade and the outdoor the fan motor 3. Tighten or replace the sleeve
loose
4. The outdoor fan stops working 4. Eliminate the malfunction cause
5. The connection between the high-pressure switch and the main control 5 、Reconnect the wire plug to the main control
board loose board
6. High-pressure switch malfunction 6. Replace the high-pressure switch
7. The outdoor exchanger is dirty or sticky 7. Clean the heat exchanger
8. There are some airs in the refrigerant line 8. Refill the freon unit after vacuuming it
9. The capillary or the filter is blocked 9. Replace the capillary or filter
10. Instantaneous the power-off 10. Restart the unit
1. Refrigerant leak 1 、 Find   out   the   leak   point, repair   the
2. Low-pressure switch failure welding, refill the freon unit after vacuuming it
3. Instantaneous the power-off 2. Replace the low-pressure switch
H4(B4) Low-pressure protection 4. Stop valve closed 3. Restart the unit
5. In cooling mode the indoor unit EXV close or block 4. open the stop valve
6. In heating mode the outdoor unit EXV close or block 5. Refill the freon unit after vacuuming it
7. In heating mode the outdoor unit the fan stop 6. Refill the freon unit after vacuuming it
8. In heating mode the outdoor unit air outlet block
H6(B6) DC inverter the compressor over-current 1. The outdoor unit the fan motor malfunction 1. Replace the fan motor
limit frequency protection 2. The outdoor ventilation insufficient
2. Improve or enhance the ventilation
DC inverter the compressor overload
H7(B7) 3. The power supply incorrect 3. Change the power supply
shutdown protection
Fix the speed of the compressor 1 overcurrent 1. The stop valve closed 1. Open the stop valve
H8(B8) 2. The outdoor ventilation insufficient
2. Improve or enhance the ventilation
protection 3. System supplies the power voltage exceeds the limit (Rated voltage
3. Install a voltage stabilizer
15%)
Fix the speed of the compressor 2 overcurrent 4. Replace the compressor
H9(B9) 4. The compressor failure
5. Replace replace the compressor
protection 5. Replace the compressor failure
1. System supply the power voltage exceeds the limit (Rated voltage 15%) 1. Install a voltage stabilizer
HA(BA) Input the power supply overvoltage 2. Instantaneous the power-off 2. Restart the unit
&undervoltage protection 3. Electrical wiring incorrect 3. Reconnect
4. Main control board malfunction 4. Replace the main control board
HC(BB) Input the power supply phase dislocation 1.  Input the power supply phase dislocation 1. Exchange two-phase sequence of the Input
protection the power supply
2. The outdoor unit PCB failure 2. Replace the outdoor unit PCB
1. The communication wire between the outdoor units is short 1. Replace the communication wire
circuit or connect incorrectly.
The communication the fault between 2. Replace the main control board
J1(D1) 2. The outdoor unit main control board failure
the outdoor units 3. Reset the outdoor unit quantity setting dip switch
3. The outdoor unit quantity setting incorrect
4. The power on the outdoor unit’s main power
4. The outdoor unit main power failed
32

 

1. The communication wire between the indoor unit and the outdoor 1. Replace the communication wire
The communication the fault between unit open circuit, short circuit, or connect incorrectly.
J2(D2) 2. the power on the indoor unit
the outdoor unit and the indoor unit 2. The indoor unit the power off
3. Replace the indoor unit PCB
3. The indoor unit PCB failure
1. The connection between the driving module and the main PCB 1. Replace the communication wire
failure
The communication the fault between 2. Replace control PCB
J3(D3) 2. The communication part of the outdoor unit control PCB failure
control board and INV module 3. Replace the Frequency of the diving board
3. Frequency of the driving board failure
4. Replace INV with the compressor
4. INV the compressor failure
1. The communication wire is an open circuit or short circuit 1. Replace the communication wire
J4(D4) The communication the fault between 2. The communication part of the outdoor unit control PCB failure 2. Replace control PCB
control board and the fan the driving module 3. The fan the driving module failure 3. Replace the fan with the driving module
4. The outdoor the fan failure 4. Replace the outdoor the fan
J5(D5) The outdoor unit address &capacity 1. The outdoor unit address dip switch setting incorrect 1. Reset address dip switch
parameter setting incorrect 2. The outdoor unit capacity dip switch setting incorrect 2. Reset the capacity dip switch
1. Supply voltage exceeds the limit 1. Install a voltage stabilizer
31 Module protection (F0) 2. The outdoor fan stop or low speed 2. Improve or enhance the ventilation
3. Module malfunction 3. Replace Module
32 Module hardware protection Module malfunction Replace Module
33 Module software protection Module malfunction Replace Module
1. The connection of the driving module and DC inverter to the compressor 1. Reconnect correctly
DC inverter the compressor incorrect
34 2. Replace the driving module
unconnected 2. The driving module failure
3. Replace the compressor
3. DC inverter the compressor the fault
1. The compressor overload 1. Eliminate overload causes
35 DC inverter the compressor over-current 2. The compressor coil disconnect 2. Replace the compressor
protection 3. Inverter the driving board failure 3. Replace the driving module
4. The compressor failure 4. Replace the compressor
36 The driving module overvoltage & 1. Supply voltage exceeds the limit 1. Install a voltage stabilizer
undervoltage protection 2. The driving module failure 2. Replace the driving module
37 The driving module radiator temperature 1. The driving module PCB failure 1. Replace the driving module PCB
sensor the fault 2. Temperature sensor broken 2. Replace the temperature sensor
Radiator high-temperature protection 1. The driving module failure 1. Replace the driving module
38 2. The compressor failure 2. Replace the compressor
(Frequency reduction) 3. The outdoor unit the fan stop or low speed 3. Improve or enhance the ventilation
1. The driving module failure 1. Replace the driving module
39 The driving module’s high-temperature 2. The compressor overload or the compressor is blocked 2. Improve or enhance the ventilation or replace
shutdown protection the compressor
3. The outdoor unit the fan stop or low speed 3. Improve or enhance the ventilation
3A Module protection of DC the fan 1. The driving module failure 1. Replace the driving module
33

 

AUX-CAC MINI ARV
2. DC the fan motor overload 2. Improve or enhance the ventilation
3. DC the fan motor stuck 3. Replace the fan motor
3C Over-current protection of DC the fan 1. DC the fan motor overload 1. Improve or enhance the ventilation
2. DC the fan motor short circuit or stuck 2. Replace the fan motor
3H Startup failure or out-of-step The driving module failure Replace the driving module
operation of DC the fan module
3J DC overvoltage and undervoltage The driving module failure Replace the driving module
protection of DC the fan (The module output voltage is abnormal)

 

 

 

AUX AC Error Codes model 2021

No. Failure Code Failure Name Primary Troubleshooting Parts
1 L0 DC Over/Under-voltage Failure The outdoor unit controller / the power grid
2 L1 Overcurrent Protection on Phase Current The outdoor unit controller / the power grid /
of The compressor the compressor/the compressor wire
3 L2 Step Failure of The compressor The outdoor unit controller / the power grid /
the compressor/system pressure
4 L3 Phase Failure of The compressor The outdoor unit controller / the power grid /
the compressor/the compressor wire
5 L4 Driver Module IPM Failure of The compressor The outdoor unit controller / the power grid /
the compressor
6 L5 PFC Overcurrent Hardware Protection The outdoor unit controller / the power grid
7 L6 PFC Overcurrent Software Protection The outdoor unit controller / the power grid
8 L7 AD Abnormal Protection in Current The outdoor unit controller
Detection
9 L8 Shunt Resistance Imbalance Failure The outdoor unit controller
10 L9 IPM Temperature Sensor Failure The outdoor unit controller
11 LA The compressor Startup Failure The outdoor unit controller / the power grid /
the compressor/the compressor wire
12 LC AD Abnormal Protection in PFC Current The outdoor unit controller
Detection

 

 

Display the error code of the indoor unit: fix speed A/C & E1.  E2, E3 and E4 Errors

No. Error Code Error Name Probable Trouble Location
1 E1 Internal room temperature Internal room temperature sensor, the main internal
sensor error control panel
2 E2 External coil sensor error External coil sensor error, the main external control
panel
3 E3 Internal coil sensor error Internal coil sensor error, the main internal control
panel
4 E4 The indoor the fan error Mechanical jam of internal the fan blade, internal fan,
the main internal control panel
5 E5(5E) The indoor and the outdoor unit Bridge cable, the main internal control panel, the main
communication error external control panel, module panel
6 F0 The outdoor DC the fan error Mechanical jam of external the fan, external DC of the fan,
the main external control panel
7 F1 Module protection error The power voltage, the compressor cable, the reactor, the module
the panel, the main external control panel, the compressor
8 F2 PFC protection error The power voltage, reactor, module panel, the main
external control panel
9 F3 The compressor out-of-step System pressure, the compressor cable, module panel,
error the main external control panel, the compressor
10 F4 Exhaust air sensor error Exhaust air sensor, the main external control panel
11 F5 The compressor cap sensor error System pressure, the compressor cap sensor
(Protection switch), the main external control panel
12 F6 External room temperature External room temperature sensor, the main external
sensor error control panel
13 F7 OVP or UVP error The power voltage, reactor, module panel, the main
external control panel
The main external control panel Connection wire of module and the main control data,
14 F8 and module panel
module panel, the main external control panel
communication error
15 F9 The outdoor EE error The main external control panel
16 FA Recirculated sensor error Recirculated sensor, the four-way valve, and the main external
control panel

 

Aux Portable A/C Error Codes

No. Error Name Reference Code( Reference Code
AUX) (ELECTROLUX)
1 Internal temperature sensor error E1 AS
2 Internal coil sensor error E3 ES
3 Lower DC motor error E4 L3
Communication Failure between
4 Display board and The main Control E8 E4
Panel
5 The water Full Alarm P1 P1

 

Watch the video-

 

In conclusion, understanding Aux Air Conditioner error codes is essential for maintaining the optimal performance of your air conditioning unit. Regular maintenance and cleaning of your air conditioning unit can also prevent future errors and malfunctions.

I hope this guide has provided you with valuable insights into Aux AC error codes, and you can now enjoy a comfortable and cool summer season with your air conditioning unit functioning at its best.

 

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How to Fix E6 Gree AC Error Code

 

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Basic Automatic Washing Machine All Error Codes

Basic Automatic Washing Machine All Error Codes

Here are all the error codes for Basic Automatic Washing Machines. All error codes detail washing machine models and types.   Basic Top Load Washing Machine All Error Codes    BAWMT-N07WS All Error Codes Troubleshooting E1 – Water Inlet Problem Check if the water tap is open or closed or have proper water pressure in […]

Fisher Automatic Washing Machine All Error Codes

Fisher Automatic Washing Machine All Error Codes

Here are all the error codes for Fisher Automatic Washing Machines. All error codes detail washing machine models and types.   Fisher Top Load Washing Machine Error Codes FAWMT-E07SBN All Error Codes Troubleshooting E1 – Water Inlet Problem Check if the water tap is open or closed or if there is proper water pressure in the water […]