Aux Mini ARV Ⅱ AC Error Codes

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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 connected 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. The 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 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 units 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 is insufficient
4. EXV blocked
DC inverter the compressor discharge 5. Refrigerant filter blocked
E3 6. The gas pipe stop valve closed
temperature “Tri” protection
7. Liquid pipe stop valve closed
8. System exhaust sensor the fault
9. The system lacks 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 is insufficient
E4 NO1. discharge temperature “Td1”
4. EXV blocked
protection (shut down)
5. Refrigerant filter blocked
6. The 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. The 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 is insufficient 1. Improve or enhance the ventilation
2. The outdoor fan blade is broken 2. Replace the fan blade

 

3. The connection between the fan blade and the outdoor 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 lose 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 is 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 is 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 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 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 fault between 2. Replace control PCB
J3(D3) 2. The communication part of the outdoor unit controls 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 fault between 2. The communication part of the outdoor unit controls 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 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)

 

 

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