Heat Pump Re: Compressor Kicks On and Off in Heating The compressor and condenser fan motor cycle on and off rapidly. Often accompanied by burnt compressor contactor points from excessive cycling. ► The Low and High Pressure switches are wired in series with the "Y" output from the...

Make: Trane Model or Series: 4TTR3024 Type: A/C Problem Description: A/C not cooling as good as it should. Low cooling. Observed Symptoms: Lower than normal suction pressure High superheat Subcooling accurate Low air temperature drop Solution: Unit suffering from...

Demand Defrost Control There are two versions of the defrost control board: Mnemonic No. 07255 = PSC Motor Mnemonic No. 07256 = ECM Motor The demand defrost control measures heat pump outdoor ambient temperature with a sensor located outside the outdoor coil. A second sensor located on...