Room Air Conditioner- Split Wall-Mounted Type: Fisher Air Conditioner Error Codes and Troubleshooting Error Code Cause E0 Indoor unit EEPROM parameter error E1 Indoor / outdoor units communication error E3 Indoor fan speed has been out of control E4 Indoor room temperature sensor T1 open circuit or short circuit E5 Evaporator coil temperature sensor T2 open circuit or short circuit EC Refrigerant leakage detection F0 Overload current protection F1 Outdoor ambient temperature sensor T4 open circuit or short circuit F2 Condenser coil temperature sensor T3 open circuit or short circuit F3 Compressor discharge temperature sensor T5 open circuit or short circuit F4 Outdoor unit EEPROM parameter error F5 Outdoor fan speed has been out of control P0 IPM malfunction or IGBT over-strong current protection P1 Over voltage or over low voltage protection P2 High temperature protection of IPM module or compressor top P4 Inverter compressor drive error Fault Symptom : The display board s...