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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