Haier Air Conditioner Error Codes

Complete Troubleshooting & Repair Guide

Protection System Errors
E1
High Pressure Protection
  • Check condenser coil for dirt or blockage.
  • Ensure outdoor airflow is not restricted.
  • Inspect refrigerant pressure levels.
  • Allow system to cool before restart.
E2
Indoor Anti-Freeze Protection
  • Check evaporator coil for ice buildup.
  • Clean air filters and improve airflow.
  • Inspect indoor fan operation.
  • Restart unit after thawing.
E3
Low Pressure Protection
  • Inspect refrigerant for possible leakage.
  • Check compressor operation.
  • Ensure proper system charge.
  • Call technician if pressure remains low.
E4
Compressor Discharge Temperature High
  • Clean outdoor condenser coil.
  • Check refrigerant circulation.
  • Inspect compressor load condition.
  • Allow system cooling before restart.
E5
Overcurrent Protection
  • Inspect power supply stability.
  • Check compressor wiring and load.
  • Verify circuit breaker condition.
  • Restart after power reset.
System & Communication Errors
E6
Communication Failure
  • Inspect indoor-to-outdoor wiring connection.
  • Check communication cable integrity.
  • Reset system power completely.
  • Replace PCB if issue persists.
E7
Mode Conflict Detected
  • Ensure all units are set to same mode.
  • Avoid mixing heating and cooling modes.
  • Restart system controller.
  • Reset settings if necessary.
E8
Indoor Fan Malfunction
  • Check fan motor for obstruction.
  • Inspect wiring and capacitor.
  • Clean dust buildup.
  • Replace fan motor if not operating.
Sensor Errors
F1
Indoor Ambient Sensor Fault
  • Inspect room temperature sensor wiring.
  • Test thermistor resistance.
  • Check connector stability.
  • Replace sensor if faulty.
F2
Evaporator Sensor Error
  • Check evaporator coil sensor connection.
  • Inspect for frost or damage.
  • Test sensor values.
  • Replace if readings are abnormal.
F3
Outdoor Ambient Sensor Fault
  • Inspect outdoor sensor wiring harness.
  • Check for corrosion or damage.
  • Test sensor resistance.
  • Replace sensor if needed.
F4
Condenser Sensor Issue
  • Inspect condenser sensor location.
  • Check wiring and connectors.
  • Test sensor continuity.
  • Replace faulty sensor if necessary.
Important: If the error persists after troubleshooting, disconnect power immediately and contact a certified HVAC technician.