Kelvinator Air Conditioner Error Codes Error Codes Problem EE Loading EEPROM Malfunction E2 Anti-Freeze Protection E3 Refrigeration System Blocked/Gas Leak E4 Compressor High Temp Protection E5 AC-Over Current Protection E6 Communications Fault E8 Anti-High Temperature Protection F1 Sensor, Room Temperature (Indoor) F2 Sensor, Tube Temperature (Indoor) F3 Sensor, Ambient (Outdoor) F4 Sensor, Coil (Outdoor) F5 Sensor, Compressor Discharge (Outdoor) F6 Anti-High Temperature Protection FH Anti-Freeze Limit, Frequency Drop H1 Defrosting. It is normal. The unit is in defrosting mode and heating will recommence soon. H3 Compressor Overload Protection H5 IPM Protection H6 Fan Stall, Indoor Unit HC PFC Protection P1 Compressor Rated Frequency-Test State P2 Compressor Maximum Frequency-Test State P3 Compressor Medium Frequency-Test State PH High Voltage Protection PL Low Voltage Protection PO Compressor Minimum Frequency-Test State LP Indoor & Outdoor Units Don’t Match L3 ...