Haier Inverter AC Error Codes List (J, S, EA, Novel, FlexFit Series)
Updated 7 September 2026 · By SolarNevs Research Desk, Dealer surveys + verified sources · 6 sources · Method ↗
Key Takeaways
- Haier inverter AC error codes are specific to the model series; codes are not universal across all units.
- Communication faults (E7) and power supply issues (Code 6 / F19) are commonly reported.
- Always disconnect power at the breaker and wait at least 30 seconds later, cut off the power before inspecting any AC components.
- Many internal faults, especially those involving PCBs, compressors, or refrigerant, require a qualified technician.
What do Haier Inverter AC error codes mean?
Haier inverter AC error codes indicate specific malfunctions within your air conditioning system. These codes help diagnose problems ranging from sensor failures and communication issues to compressor faults and power supply irregularities. Because Haier manufactures several distinct product platforms, the meaning of a specific code can vary significantly depending on your AC's series (e.g., J, S, EA, Novel, or FlexFit). Always identify your unit's series before attempting to interpret an error code.
Diagnosis Steps
When your Haier inverter AC displays an error code, follow these steps to gather information for troubleshooting.
- Identify the Displayed Code: Note the exact error code shown on your indoor unit's digital display. If your indoor unit does not have a digital display, check for blinking patterns on the outdoor unit's LED1.
- Determine Your AC Series: Haier has different product platforms, and error codes are not universal. Check your unit's model number (usually on a sticker on the side of the indoor unit or on the outdoor unit) and refer to the tables below to identify its series (e.g., J, S, EA, Novel, FlexFit).
- Power Cycle the Unit: Turn off the AC unit at the main power breaker. Wait for at least 30 seconds later, cut off the power, then restore power. This can sometimes clear temporary glitches.
- Observe for Recurrence: If the error code reappears after power cycling, proceed with further diagnosis based on the specific code and your unit's series.
- Inspect Visible Connections: After ensuring the main power is off and waiting the recommended 30 seconds for capacitors to discharge, visually inspect the wiring between the indoor and outdoor units for any loose connections or visible damage.
Haier Inverter AC Error Code Tables
Error codes are not universal across Haier AC series. The codes and their meanings differ significantly between product families. Always refer to the specific model's service manual to correctly diagnose faults. Do not merge code tables from different series.
Error Codes for J and S Platform Models (1U26JACFRA, 1U35JACFRA, 1U53RABFRA, 1U71SABFRA)
Code (Indoor Display) | Code (Outdoor LED1 Flash Times) | Fault Description | Fix Direction / Verbatim Fragment |
|---|---|---|---|
E7 | 15 | Communication fault between indoor and outdoor units | Communication fault between indoor and outdoor units |
E1 | -- | Room temperature sensor failure | Room temperature sensor failure |
E2 | -- | Heat-exchange sensor failure | Heat-exchange sensor failure |
E4 | -- | Indoor EEPROM error | Indoor EEPROM error |
E14 | -- | Indoor fan motor malfunction | Indoor fan motor malfunction |
-- | 1 | Outdoor EEPROM error | Outdoor EEPROM error |
-- | 2 | The protection of IPM | The protection of IPM |
-- | 3 | Overcurrent protection of AC electricity for the outdoor model | Overcurrent protection of AC electricity for the outdoor model |
-- | 4 | Communication fault between the IPM and outdoor PCB | Communication fault between the IPM and outdoor PCB |
-- | 5 | Compressor overload | Compressor overload |
-- | 6 | Power voltage is too high or low | Power voltage is too high or low |
-- | 7 | Compressor blocked | Compressor blocked |
-- | 8 | Overheat protection for Discharge temperature | Overheat protection for Discharge temperature |
-- | 9 | Outdoor DC fan motor fault | Outdoor DC fan motor fault |
-- | 10 | Defrost temperature sensor failure | Defrost temperature sensor failure |
-- | 11 | Suction temperature sensor failure | Suction temperature sensor failure |
-- | 12 | Ambient temperature sensor failure | Ambient temperature sensor failure |
-- | 13 | Discharge temperature sensor failure | Discharge temperature sensor failure |
-- | 14 | Suction temp of compressor is too high | Suction temp of compressor is too high |
-- | 16 | Less gas charge | Less gas charge |
-- | 17 | 4-way-valve fault | 4-way-valve fault |
-- | 18 | deviate from the normal for the compressor | deviate from the normal for the compressor |
-- | 19 | Loop of the station detect error | Loop of the station detect error |
-- | 24 | Overcurrent of the compressor | Overcurrent of the compressor |
-- | 25 | Overcurrent protection for single-phase of the compressor | Overcurrent protection for single-phase of the compressor |
Error Codes for EA-Series and Novel Series Models (HSU09VHJ(DB), HSU12/18VHJ(DB), HSU09VHG(DB)-W/G, HSU12VHG(DB)-W/G, HSU18VHH(DB)-W/G, HSU24VHG(DB)-W/G)
Code (Indoor Display) | Code (Outdoor LED1 Flash Times) | Fault Description | Fix Direction / Verbatim Fragment |
|---|---|---|---|
E7 | 15 | Communication fault between indoor and outdoor units | Communication fault between indoor and outdoor units |
E1 | -- | Room temperature sensor failure | Room temperature sensor failure |
E2 | -- | Heat-exchange sensor failure | Heat-exchange sensor failure |
E4 | -- | Indoor EEPROM error | Indoor EEPROM error |
E14 | -- | Indoor fan motor malfunction | Indoor fan motor malfunction |
F12 | 1 | Outdoor EEPROM error | Outdoor EEPROM error |
F1 | 2 | The protection of IPM | The protection of IPM |
F22 | 3 | Overcurrent protection of AC electricity for the outdoor model | Overcurrent protection of AC electricity for the outdoor model |
F3 | 4 | Communication fault between the IPM and outdoor PCB | Communication fault between the IPM and outdoor PCB |
F19 | 6 | Power voltage is too high or low | Power voltage is too high or low |
F27 | 7 | Compressor has a locked rotor or stopped momentary | Compressor has a locked rotor or stopped momentary |
F4 | 8 | Overheat protection for exhaust temperature | Overheat protection for exhaust temperature |
F8 | 9 | Outdoor DC fan motor fault | Outdoor DC fan motor malfunction |
F21 | 10 | Frost-removing temperature sensor failure | Frost-removing temperature sensor failure |
F7 | 11 | SUCK temperature sensor failure | SUCK temperature sensor failure |
F6 | 12 | Ambient temperature sensor failure | Ambient temperature sensor failure |
F25 | 13 | Exhaust temperature sensor failure | Exhaust temperature sensor failure |
F11 | 18 | Deviate from the normal for the compressor | deviate from the normal for the compressor |
F28 | 19 | Loop of the station detect error | Loop of the station detect error |
F2 | 24 | Overcurrent of the compressor | Overcurrent of the compressor |
F23 | 25 | Overcurrent protection for single-phase of the compressor | Overcurrent protection for single-phase of the compressor |
F36 | 39 | Middle part of condenser temperature sensor failure | Middle part of condenser temperature sensor failure |
Error Codes for FlexFit Series Models (1U12LC2VHA, 1U18LC2VHA)
Code (Indoor Display) | Code (Outdoor LED1 Flash Times) | Fault Description | Fix Direction / Verbatim Fragment |
|---|---|---|---|
E7 | 15 | Communication fault between indoor & outdoor unit | Communication fault between indoor&outdoor unit |
F12 | 1 | Faulty of outdoor unit EEPROM | Faulty of outdoor unit EEPROM |
F1 | 2 | IPM overcurrent or short circuit | IPM overcurrent or short circuit |
F3 | 4 | Communication failure between Module and ECU | Communication failure between Module and ECU |
F20 | 5 | Module operated overload | Module operated overload |
F19 | 6 | Module low or high voltage | Module low or high voltage |
F4 | 8 | Discharging temperature overheating. Lack of refrigerant, ambient temperature too high or PMVs blocked. | Discharging temperature overheating.Lack of refrigerant, ambient temperature too high or PMVs blocked. |
F8 | 9 | Malfunction of the DC fan motor | Malfunction of the DC fan motor |
F21 | 10 | Malfunction of defrosting temp. sensor | Malfunction of defrosting temp. sensor |
F7 | 11 | Malfunction of compressor suction temp. sensor | Malfunction of compressor suction temp. sensor |
F6 | 12 | Malfunction of ambient temp. sensor | Malfunction of ambient temp. sensor |
F25 | 13 | Malfunction of compressor discharge temp. sensor | Malfunction of compressor discharge temp. sensor |
F13 | 16 | Lack of refrigerant or discharging | Lack of refrigerant or discharging |
F14 | 17 | 4-way valve switching failure | 4-way valve switching failure |
F11 | 18 | Loss of synchronism detection | Loss of synchronism detection |
E9 | 20 | Indoor thermal overload | Indoor thermal overload |
E5 | 21 | Indoor frosted | Indoor frosted |
F5 | 23 | Module thermal overload | Module thermal overload |
F2 | 24 | Compressor start failure | Compressor start failure |
F23 | 25 | Module current detect circuit malfunction | Module current detect circuit malfunction |
F9 | 26 | MCU reset | MCU reset |
F24 | 27 | Module current detect circuit malfunction | Module current detect circuit malfunction |
F10 | 28 | Malfunction of liquid pipe temp. sensor for indoor unit A | Malfunction of liquid pipe temp. sensor for indoor unit A |
F16 | 29 | Malfunction of liquid pipe temp. sensor for indoor unit B | Malfunction of liquid pipe temp. sensor for indoor unit B |
F17 | 30 | Malfunction of liquid pipe temp. sensor for indoor unit C | Malfunction of liquid pipe temp. sensor for indoor unit C |
F18 | 31 | Malfunction of liquid pipe temp. sensor for indoor unit D | Malfunction of liquid pipe temp. sensor for indoor unit D |
F29 | 32 | Malfunction of gas pipe temp. sensor for indoor unit A | Malfunction of gas pipe temp. sensor for indoor unit A |
F30 | 33 | Malfunction of gas pipe temp. sensor for indoor unit B | Malfunction of gas pipe temp. sensor for indoor unit B |
F31 | 34 | Malfunction of gas pipe temp. sensor for indoor unit C | Malfunction of gas pipe temp. sensor for indoor unit C |
F32 | 35 | Malfunction of gas pipe temp. sensor for indoor unit D | Malfunction of gas pipe temp. sensor for indoor unit D |
F26 | 36 | Malfunction of gas pipe temp. sensor for indoor unit E | Malfunction of gas pipe temp. sensor for indoor unit E |
F35 | 38 | Malfunction of module temp. sensor Momentary power failure detection | Malfunction of module temp. sensor Momentary power failure detection |
F36 | 39 | Malfunction of condensing temp. sensor | Malfunction of condensing temp. sensor |
F33 | 40 | Malfunction of liquid pipe temp. sensor for indoor unit E | Malfunction of liquid pipe temp. sensor for indoor unit E |
F38 | 41 | Malfunction of ‘Toci’ temp. sensor | Malfunction of ‘Toci’ temp. sensor |
F39 | 42 | System high pressure switch off | System high pressure switch off |
F40 | 43 | System low pressure switch off | System low pressure switch off |
F41 | 44 | System high pressure protection. Refrigerant overabundance, High condensing temp. or malfunction of fan motor. | System high pressure protection.Refrigerant overabundance, High condensing temp. or malfunction of fan motor. |
F42 | 45 | System low pressure protection. Refrigerant shortage, Low defrosting temp., or malfunction of fan motor. | System low pressure protection.Refrigerant shortage, Low defrosting temp., or malfunction of fan motor. |
Error Codes for R290 Hydro Split Models
The R290 Hydro Split series is a heat pump water heater system, distinct from typical air conditioners. Its error codes are listed separately.
Code (Outdoor Digital Display Tube) | Code (Indoor Wired Controller) | Error Description | Remarks |
|---|---|---|---|
E01 | HU | Water Inlet Temperature Sensor Abnormality | Resumable |
E02 | HU | Water Outlet Temperature Sensor Two // Tout2 Abnormality | Resumable |
E03 | HU | Liquid Pipe Temperature Sensor Abnormality | Resumable |
E04 | HU | Gas Pipe Temperature Sensor Abnormality | Resumable |
E05 | -- | EEPROM Abnormality | Unresumable |
E06 | -- | Communication Error between Outdoor Unit and Indoor Unit | Resumable |
E07 | -- | Communication Error between Remote Wired Controller and Indoor Unit | Resumable |
E08 | -- | Flow Switch Abnormality / Low Water Flow | Resumable (If it occurs 3 times in an hour, confirm the failure.) |
E09 | -- | Indoor Unit Address Duplication Abnormality | Resumable |
E10 | -- | DHW Tank Temperature Sensor Abnormality | Resumable |
E11 | -- | I/O PCB Communication Abnormality | Resumable |
E12 | HU | ZONE2 Water Mixing Valve Temperature Sensor Abnormality | Resumable |
E13 | -- | Water Leakage (reserved) | Unresumable |
E14 | -- | Low Pressure Switch Abnormality (reserved) | Resumable |
E15 | -- | Anti-freeze Abnormality | Resumable (If it occurs 3 times in an hour, confirm the failure.) |
E16 | HU | Water Inlet/Outlet Temperature Over High | Resumable |
E17 | HU | ZONE1 Ambient Temperature Sensor Abnormality | Resumable |
E18 | HU | ZONE2 Ambient Temperature Sensor Abnormality | Resumable |
E19 | -- | Pool Mixing Valve Water Outlet/Pool Water Temperature Sensor | Resumable |
E20 | -- | Outdoor Unit Abnormality | -- |
E20-0 | -- | Outdoor Condenser Defrosting Coil Temperature Sensor Te1 Abnormality | Resumable |
E20-1 | -- | Outdoor Condenser Defrosting Coil Temperature Sensor Te2 Abnormality | Resumable |
E21 | -- | Outdoor Ambient Temperature Sensor Abnormality | Resumable |
E22 | -- | Outdoor Compressor Suction Temperature Sensor Abnormality | Resumable |
E23 | -- | Compressor Discharge Temperature Sensor Abnormality | Resumable |
E24 | -- | Compressor Oil Temperature Sensor Toil Abnormality | Resumable |
E27 | -- | Oil Temperature Over High Protection(Toil) | Unresumable (Once confirmed, if it occurs 3 times in an hour, confirm the failure.) |
E28 | -- | Compressor Discharge Pressure Sensor Abnormality | Resumable |
E29 | -- | Compressor Suction Pressure Sensor Abnormality | Resumable |
E30 | -- | High Pressure Switch HPS Abnormality | Unresumable (Once confirmed, if it occurs 3 times in an hour, confirm the failure.) |
E32-0 | -- | Outdoor Subcooling Coil Outlet Temperature Sensor Abnormality | Resumable |
E32-1 | -- | Outdoor Liquid Pipe Subcooling Temperature Sensor Abnormality | Resumable |
E33 | -- | Outdoor Unit PCB EEPROM Abnormality | Unresumable |
E34 | -- | Compressor Discharge Temperature Over High Protection(Td) | Unresumable (Once confirmed, if it occurs 3 times in an hour, confirm the failure.) |
E35 | -- | Four Way Valve Reversing Abnormality | Unresumable (The fault is cleared after 3 minutes. If it occurs 3 times in an hour, confirm the failure.) |
E36 | -- | Oil Temperature Over Low Protection(Toil) | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E38 | -- | High Pressure Over Low Protection | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E39-0 | -- | Low Pressure Over Low Protection | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E39-1 | -- | Compression Ratio Over High Protection | Resumable (If it occurs 3 times in an hour, confirm the failure.) |
E40 | -- | High Pressure Over High Protection | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E43 | -- | Compressor Discharge Temperature Sensor Over Low Protection | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E46 | -- | Communication Error with Driver PCB | Resumable |
E49 | -- | Low Pressure Switch Abnormality | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E51-0 | -- | LEVa Overcurrent Protection | Resumable |
E51-2 | -- | LEVb Overcurrent Protection | Resumable |
E52-0 | -- | LEVa Disconnection Abnormality | Resumable |
E52-2 | -- | LEVb Disconnection Abnormality | Resumable |
E53 | -- | CT Current Over Low or Current Sensor Abnormality | Resumable |
E54 | -- | Communication Error with Subcooling Module | Resumable |
E57 | -- | Communication Error between Subcooling Module and Main PCB (sent by Subcooling Module) | Resumable |
E58 | -- | Subcooling Module Tc1 Temperature Sensor Error (sent by Subcooling Module) | Resumable |
E59 | -- | Subcooling Module Tc2 Temperature Sensor Error (sent by Subcooling Module) | Resumable |
E60 | -- | Subcooling Module (sent by Subcooling Module) Reserved | Resumable |
E61 | -- | Subcooling Module (sent by Subcooling Module) Reserved | Resumable |
E62 | -- | Subcooling Module (sent by Subcooling Module) Reserved | Resumable |
E63 | -- | Subcooling Module Dip Switch Error | Unresumable |
E64 | -- | CT Current Over High | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E65 | -- | Electrical Control Box Temperature Sensor(Tb) Abnormality | Resumable |
E68 | -- | Communication Error with DHW I/O PCB | Resumable |
E69 | -- | DHW I/O PCB Tank Temperature Abnormality | Resumable |
E70 | -- | DHW I/O PCB Other Abnormalities Reserved | Resumable |
E71-0 | -- | Upper DC Fan Motor Abnormality | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E71-1 | -- | Lower DC Fan Motor Abnormality | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E74 | -- | System Emergency Stop Abnormality | Resumable |
E81 | -- | Compressor Driver PCB Temperature Over High Protection | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E82 | -- | Compressor Current Protection | Unresumable (If it occurs 3 times in an hour, confirm the failure.) |
E83 | -- | Incorrect Outdoor Unit Dip Switch Setting | Unresumable |
E87 | -- | Defrosting with Over Low Water Temperature | Resumable |
E110 | -- | Compressor Hardware Overcurrent | Unresumable (If it occurs 4 times in an hour, confirm the failure.) |
E111 | -- | Compressor Loss of Synchronism | Resumable |
E111-4 | -- | Fan Motor Loss of Synchronism | -- |
E112 | -- | Compressor Driver PCB Heat Sink Temperature Over High | Resumable |
E112-4 | -- | Fan Motor Driver PCB Heat Sink Temperature Over High | -- |
E114 | -- | The input power supply voltage of the inverter is abnormal | Resumable |
E116 | -- | Communication Error between Compressor Driver PCB and Main PCB | Resumable |
E117 | -- | Compressor Software Overcurrent | Resumable |
E117-4 | -- | Fan Motor Software Overcurrent | -- |
E118 | -- | Compressor Start-up Abnormality | Resumable |
E119 | -- | Compressor Driver PCB Current Detect Circuit Abnormality | Resumable |
E121 | -- | Compressor Control Board Power Supply Abnormality | Resumable |
E122 | -- | Compressor Driver PCB Heat Sink Temperature Sensor Abnormality | Resumable |
E124 | -- | Compressor Driver PCB Three-Phase Power Supply Abnormality | Resumable |
Common Symptoms, Causes, and Fixes
This table provides general troubleshooting for common symptoms and error codes across various Haier inverter AC series.
Error Code/Symptom | Likely Cause | Fix |
|---|---|---|
None of the units operates | Power supply issue | Check main power breaker, ensure power is on. |
None of the units operates | Indoor PCB broken | Consult a qualified technician. |
Operation sometimes stops | Power failure of 2 to 10 cycles | Check for unstable grid power or issues with your home's electrical supply. |
Equipment operates but does not cool/heat | Faulty operation of the electronic expansion valve | Requires professional diagnosis and repair of the electronic expansion valve. |
Equipment operates but does not cool/heat | Insufficient gas | Requires a qualified technician to check for leaks and recharge refrigerant. |
Large operating noise and vibrations | Installation condition (e.g., insufficient space) | Ensure proper installation with adequate space around the outdoor unit. |
E1, E2, F6, F7, F21, F25 (Thermistor/Sensor Abnormality) | Faulty connector connection | After safely disconnecting power, check and secure sensor wire connections. |
E1, E2, F6, F7, F21, F25 (Thermistor/Sensor Abnormality) | Faulty thermistor | Requires replacement of the faulty thermistor by a technician. |
E1, E2, F6, F7, F21, F25 (Thermistor/Sensor Abnormality) | Faulty PCB | Consult a qualified technician. |
E14 (Indoor fan motor malfunction) | Operation halt due to breaking of wire inside the fan motor | Requires professional inspection and repair of the fan motor wiring. |
E14 (Indoor fan motor malfunction) | Operation halt due to breaking of the fan motor lead wires | Requires professional inspection and repair of the fan motor lead wires. |
E14 (Indoor fan motor malfunction) | Detection error due to faulty indoor unit PCB | Consult a qualified technician. |
F1, F22 (IPM protection) | Compressor faulty leads to IPM protection | Requires professional diagnosis of the compressor and IPM module. |
F1, F22 (IPM protection) | Faulty PCB of IPM module | Requires replacement of the IPM module PCB by a technician. |
F1, F22 (IPM protection) | Compressor wiring disconnected | After safely disconnecting power, check and secure compressor wiring. |
F3 (Communication fault between IPM and outdoor PCB) | Outdoor PCB broken | Consult a qualified technician. |
F3 (Communication fault between IPM and outdoor PCB) | IPM module broken | Requires replacement of the IPM module by a technician. |
F3 (Communication fault between IPM and outdoor PCB) | Communication wiring disconnected | After safely disconnecting power, check and secure communication wiring. |
F4 (Overheat Protection For Exhaust Temperature) | Electronic expansion valve defective | Requires professional diagnosis and repair of the electronic expansion valve. |
F4 (Overheat Protection For Exhaust Temperature) | Faulty thermistor | Requires replacement of the faulty thermistor by a technician. |
F4 (Overheat Protection For Exhaust Temperature) | Faulty PCB | Consult a qualified technician. |
E4, F12 (EEPROM Abnormality) | Faulty EEPROM data | Requires professional diagnosis and potential reprogramming or replacement of EEPROM. |
E4, F12 (EEPROM Abnormality) | Faulty EEPROM | Requires replacement of the faulty EEPROM by a technician. |
E4, F12 (EEPROM Abnormality) | Faulty PCB | Consult a qualified technician. |
E7 (Communication error between indoor and outdoor units) | Indoor unit-outdoor unit signal transmission error due to wiring error | After safely disconnecting power, check and secure wiring between indoor and outdoor units. |
E7 (Communication error between indoor and outdoor units) | Faulty PCB | Consult a qualified technician. |
F19, Code 6 (Power Supply Over or under voltage fault) | Supply voltage not as specified | Check your mains voltage. Ensure it is stable and within the unit's specified range (e.g., 220-240V or 208-230V). |
F19, Code 6 (Power Supply Over or under voltage fault) | The IPM module is broken | Requires replacement of the IPM module by a technician. |
F19, Code 6 (Power Supply Over or under voltage fault) | The outdoor PCB is broken | Consult a qualified technician. |
F11, F28 (Loop of the station detect error) | The wiring of compressor is wrong or the connection is poor | After safely disconnecting power, check and secure compressor wiring. |
F11, F28 (Loop of the station detect error) | The compressor is damaged | Requires replacement of the compressor by a qualified technician. |
F11, F28 (Loop of the station detect error) | Faulty PCB | Consult a qualified technician. |
F2, F23 (Over-current of the compressor) | IPM Module is damaged | Requires replacement of the IPM module by a technician. |
F2, F23 (Over-current of the compressor) | The compressor is damaged | Requires replacement of the compressor by a qualified technician. |
F2, F23 (Over-current of the compressor) | Power supply voltage is too low or too high | Power supply voltage is too low or too high |
F1 (FlexFit: IPM overcurrent or short circuit) | Overcharge | Requires a qualified technician to check refrigerant levels. |
F1 (FlexFit: IPM overcurrent or short circuit) | Dirty outdoor coil | Clean the outdoor coil to ensure proper heat exchange. |
F1 (FlexFit: IPM overcurrent or short circuit) | Hot conditioned space temperature/high load | Ensure the AC unit is appropriately sized for the space and operating conditions. |
F1 (FlexFit: IPM overcurrent or short circuit) | Refrigeration circuit restriction | Requires professional diagnosis and repair of any restrictions in the refrigeration circuit. |
F1 (FlexFit: IPM overcurrent or short circuit) | Seized compressor | Requires replacement of the compressor by a qualified technician. |
F1 (FlexFit: IPM overcurrent or short circuit) | Bad Module Board | Requires replacement of the module board by a technician. |
F3 (FlexFit: Communication failure between Module and ECU) | Wiring Plug connection between the two control boards (Module and ECU) is loose | After safely disconnecting power, check and secure the wiring plug connections. |
F3 (FlexFit: Communication failure between Module and ECU) | Module Board is defective | Requires replacement of the module board by a technician. |
F4 (FlexFit: Discharging temperature overheating) | Lack of refrigerant in the system | Requires a qualified technician to check for leaks and recharge refrigerant. |
F4 (FlexFit: Discharging temperature overheating) | Excessive heat in the conditioned space | Ensure proper insulation and shading for the conditioned space. |
F4 (FlexFit: Discharging temperature overheating) | Restriction in the refrigeration circuit | Requires professional diagnosis and repair of any restrictions in the refrigeration circuit. |
E9 (FlexFit: Indoor thermal overload) | Low charge | Requires a qualified technician to check refrigerant levels. |
E9 (FlexFit: Indoor thermal overload) | Dirty indoor coil | Clean the indoor coil to ensure proper heat exchange. |
E9 (FlexFit: Indoor thermal overload) | Faulty EEV | Requires professional diagnosis and repair of the EEV. |
Running Haier Inverter AC on Solar or UPS
Haier inverter AC units are designed to operate within specific voltage and frequency ranges. For models like 1U26JACFRA and 1U35JACFRA, the nominal voltage is 220~240V at 50Hz. Other models, such as HSU09VHG(DB)-W/G, operate at 208-230V, 60Hz.
When running your AC on solar power systems or a UPS, a stable and correctly specified power supply is critical. The manuals indicate that "Power voltage is too high or low" (Code 6 for J/S series, F19 for EA/Novel/FlexFit series) will trigger an error and protection mechanisms. This means your solar inverter or UPS must provide a clean, stable output within the AC unit's nominal voltage range.
It is important to use an exclusive power circuit for the air conditioner, rated over 10A, and ensure a breaker is incorporated into the fixed wiring with an all-pole switch and a distance between contacts not less than 3mm.
The provided manuals do not offer specific recommendations or published behavior for running Haier ACs on unstable, generator, or UPS supplies beyond general voltage tolerance. If you experience frequent power-related errors (like Code 6 or F19), consult with your solar installer or UPS provider to ensure your power source meets the AC unit's requirements.
Safety
Working with air conditioning units involves significant electrical and mechanical hazards. Always prioritize safety.
- Electrical Shock Prevention: Before performing any inspection or repair, disconnect power at the main breaker supplying the AC unit. Wait at least 30 seconds for internal capacitors to discharge. Never touch charged sections or repair with wet hands. Do not splash water on the unit. Ensure proper grounding in humid or wet locations.
- Fire Prevention: Insufficient power circuit capacity or improper electrical work can cause fire. Ensure all connections are secure and use specified cables. Do not install the unit where combustible gas leaks are possible.
- Injury Prevention: Refrigerant gas can cause frostbite. If pipes are disconnected with gas remaining, refrigerant gas or oil discharges can cause injury. Internal fans rotate at high speed; keep hands clear. The cooling cycle section can become hot and cause burns.
- Refrigerant Handling: Haier units are filled with R32 refrigerant. Do not touch discharging refrigerant gas. Release refrigerant completely before disconnecting pipes. Ventilate the area if refrigerant gas leaks. Never mix air or gas other than the specified R32 refrigerant in the system.
- Capacitor Discharge: Step-up capacitors inside the unit store high voltage. Always ensure they are fully discharged before attempting any internal repairs.
- Maintenance Safety: Turn off the power switch and unplug the power cable when cleaning. Check that the cooling cycle section has cooled down sufficiently before repair.
When to call a technician instead
Many error codes indicate internal component failures that are not safe or feasible for DIY repair. You should call a qualified HVAC technician if:
- The error code points to a faulty PCB (e.g., indoor PCB broken, outdoor PCB broken, faulty EEPROM, faulty PCB of IPM module).
- The error code indicates a compressor issue (e.g., compressor faulty leads to IPM protection, compressor blocked, the compressor is damaged, compressor start failure, overcurrent of the compressor).
- The problem involves refrigerant (e.g., less gas charge, lack of refrigerant or discharging, overcharge, refrigeration circuit restriction). Handling refrigerant requires specialized tools and training.
- The issue is with the electronic expansion valve or 4-way valve.
- You are unsure about the cause of the error or uncomfortable performing any of the diagnostic steps.
A technician has the necessary diagnostic tools, safety equipment, and expertise to safely and effectively troubleshoot and repair complex AC system faults.
Frequently asked questions
What does an E7 error code mean on a Haier Inverter AC?
An E7 error code on Haier J, S, EA, Novel, and FlexFit series inverter ACs indicates a communication fault between the indoor and outdoor units. This can be caused by indoor unit-outdoor unit signal transmission error due to wiring error or a faulty PCB.
How do I troubleshoot a Haier AC showing an F1 error?
An F1 error on J, S, EA, and Novel series Haier ACs indicates 'The protection of IPM'. For FlexFit series, F1 means 'IPM overcurrent or short circuit'. This often points to issues with the compressor faulty leads to IPM protection, faulty PCB of IPM module, or compressor wiring disconnected.
What should I do if my Haier AC displays a power voltage error (F19 or Code 6)?
A power voltage error (Code 6 for J/S series, F19 for EA/Novel/FlexFit series) means the power voltage is too high or low. Check your mains voltage and ensure it is within the 220~240V range specified for models like 1U26JACFRA or 208-230V for models like HSU09VHG(DB)-W/G.
Are Haier AC error codes the same across all models?
No, Haier AC error codes are not universal across all series. The codes and their meanings differ significantly between product families like the J, S, EA, Novel, and FlexFit series. Always refer to the specific model's service manual to correctly diagnose faults.
Can I fix a Haier AC error code myself?
Some minor issues like loose wiring or power supply problems can be checked by the user after ensuring power is safely disconnected. However, faults involving internal components like PCBs, compressors, or refrigerant systems typically require a qualified technician due to safety risks and specialized knowledge, for instance, if there is a 'Faulty PCB of IPM module'.
References
- Haier 1U26JACFRA Service Manual — accessed 23 August 2026
- Haier 1U71SABFRA Service Manual — accessed 23 August 2026
- Haier EA-Series Service Manual — accessed 23 August 2026
- Haier Novel Series Service Manual — accessed 23 August 2026
- Haier FlexFit Single-Zone Service Manual — accessed 23 August 2026
- Haier R290 Hydro Split & Hydro All in One Service Manual — accessed 23 August 2026
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