looked at a trane heat pump yesterday. model geha, water source,serial # wooa01162. compressor wouldn't start, tripping on overload. replaced compressor today. unit started fine, but suction went down to 0 psi in a few seconds. high side went to 230-240. tryed 4 or 5 times, always went 0 right away.
thinking txv must have failed. unit is hanging in attic with horrible access, not sure what else could cause it to suck down so quickly other than txv? i caould only run a few seconds at a time becuase it was pumping down so quickly.