- E1 – Low voltage or loss of power
- E2 – High or low refrigerant pressure
- E3 – Blower fault or malfunction
- E4 – Indoor/outdoor communication failure
- E5 – Outdoor temperature sensor error
- E6 – High indoor temperature
- E7 – High limit switch open
- E8 – High discharge temperature
- E9 – Low refrigerant charge
- E10 – Freeze protection activation
- E11 – Compressor motor overheat
- E12 – Compressor communication error
- E13 – Compressor current overload
- E14 – Compressor start-up failure
- E15 – Inverter board failure
- E16 – Inverter voltage error
- E17 – Inverter frequency error
- E18 – Outdoor fan motor failure
- E19 – Outdoor fan speed error
- E20 – Outdoor fan current error
- E21 – Indoor fan motor failure
- E22 – Indoor fan speed error
- E23 – Indoor fan current error
- E24 – Gas valve failure
- E25 – Pressure switch error
- E26 – Ignition failure
- E27 – Flame sensor error
- E28 – Blower fan speed error
- E29 – Blower fan current error
- E30 – Blower fan control error
- E31 – Sensor open/short circuit
- E32 – Sensor out of range
- E33 – Sensor reading error
- E34 – Control board failure
- E35 – Control board communication error
- E36 – Thermostat communication error
- E37 – Thermostat error
- E38 – Thermostat mode error
- E39 – Thermostat setpoint error
- E40 – Relay failure
- E41 – Transformer failure
- E42 – Switch failure
- E43 – Circuit breaker failure
- E44 – Overload protection activation
- E45 – Electrical short circuit
- E46 – Electrical open circuit
- E47 – Voltage fluctuation
- E48 – Voltage drop
- E49 – No power to the unit
- E50 – Software error
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