Home Air Conditioner Error Codes

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Error CodeProblem
E0Indoor unit EEPROM error
E1Communication malfunction between indoor and outdoor units
E3Indoor fan speed has been out of control
E4Indoor room temperature sensor T1 open circuit or short circuit
E5Evaporator coil temprerature sensor T2 open circuit or short circuit
ECRefrigerant leakage detection
EEWater-level alarm malfunction
F1Open circuit or short circuit of outdoor ambient temperature sensor T4
F2Open circuit or short circuit
F3Open circuit or short circuit of compressor discharge temperature sensor T5
F4Outdoor unit EEPROM error
F5Outdoor fan speed has been out of control
F6Out unit low side value temperature sensor (T2B) open circuit or short circuit
F7Lifting-panel communication error
F8Lifting-panel mafunction
F9Lifting-panel is not closed
P0IPM malfunction
P1Over voltage or over low voltage protection
P2High temperature protection of compressor top. High pressure protection
P3Outdoor low temperature protection
P4Inverter compressor drive error
P5Mode conflict
P7Outdoor IGBT temperature sensor error

On, Off, cF, dF, SC, FP  Display Code Meanings;

Comfortstar Air Conditioner Display Code Meanings
Comfortstar Air Conditioner Display Code Meanings

On: for 3 seconds when:

  • TIMER ON is set
  • FRESH, SWING, TURBO, or SILENCE features are turned on

OF: for 3 seconds when:

  • TIMER OFF is set
  • FRESH, SWING, TURBO, or SILENCE features are turned off

cF: when anti-cold air feature is turned on

dF: when defrosting

SC: when unit is self-cleaning

FP:  when freeze protection is turned on

Outdoor Unit Error Display

Error CodesProblem
E0Outdoor EEPROM malfunction
E2Communication malfunction between indoor and outdoor units
E3Communication malfunction between IPM board and outdoor main board
E4Open or short circuit of outdoor temperature sensor (T3、T4、T5)
E5Voltage protection
E6Active PFC module protection
E8Outdoor fan speed has been out of control (Only for DC fan motor models)
F1No A Indoor unit coil outlet temperature sensor(T2B) open circuit or short circuit.
F2No B Indoor unit coil outlet temperature sensor(T2B) open circuit or short circuit.
F3No C Indoor unit coil outlet temperature sensor(T2B) open circuit or short circuit.
F4No D Indoor unit coil outlet temperature sensor(T2B) open circuit or short circuit.
F5No E Indoor unit coil outlet temperature sensor(T2B) open circuit or short circuit
F6No F Indoor unit coil outlet temperature sensor(T2B) open circuit or short circuit.
P0Temperature protection of compressor top
P1High pressure protection
P2Low pressure protection
P3Current protection of compressor
P4Temperature protection of compressor discharge
P5High temperature protection of condenser
P6IPM module protection

Comfortstar AC Troubleshooting

Comfortstar AC Error Codes and Troubleshoting
Comfortstar AC Error Codes and Troubleshoting

Common Issues

The following problems are not a malfunction and in most situations will not require repairs.

Issue: Unit does not turn on when pressing ON/OFF button

Possible Causes: The Unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be restarted within three minutes of being turned off.

Issue: The unit changes from COOL/HEAT mode to FAN mode

Possible Causes:

  1. The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit will start operating in the previously selected mode again.
  2. The set temperature has been reached, at which point the unit turns off the compressor. The unit will continue operating when the temperature fluctuates again.

Issue: The indoor unit emits white mist

Possible Causes: In humid regions, a large temperature difference between the room’s air and the conditioned air can cause white mist.

Issue: Both the indoor and outdoor units emit white mist

Possible Causes: When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process.

Issue: The indoor unit makes noises

Possible Causes:

  1. A rushing air sound may occur when the louver resets its position.
  2. A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit’s plastic parts.

Issue: Both the indoor unit and outdoor unit make noises

Possible Causes:

  1. Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units.
  2. Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction.
  3. Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises.

Issue: The outdoor unit makes noises

Possible Causes: The unit will make different sounds based on its current operating mode.

Issue: Dust is emitted from either the indoor or outdoor unit

Possible Causes: The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity.

Issue: The unit emits a bad odor

Possible Causes:

  1. The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations.
  2. The unit’s filters have become moldy and should be cleaned.

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