Trane Heat Pump: 4TWX8 Re: Compressor Kicks On and Off (Heating) The compressor and condenser fan motor cycle on and off rapidly. ►The 4TWX8 models have a 2-Stage Scroll compressor. ►The 4TWX8 models uses an Electronic Expansion Valve (EEV) for superheat control. ► The High Pressure...

Trane Heat Pump: 4TWX8 Re: Electronic Expansion Valve The 4TWX8 models use an outdoor Electronic Expansion Valve (EEV) for superheat control. 1. EEV Control Board Codes Green LED Description On Continuous Heat Mode - Standby 2 Sec On Cool Mode - Standby Fast...