Hi, Two weeks ago Saturday evening I noticed the a/c seemed very cold. Sunday morning registers blowing 75 degree air. Compressor not running. Shut system off and heard a rush of refrigerant in system (equalizing pressure?). Start up and compressor kicks off after about 20 seconds. Tried in heat mode system runs for 10 minutes heating house UGH! It had a problem last year in the heating mode (low pressure cutoff) and tech replaced TXV. System then ran well till now. Gauge on high side climbs to 450psig in 10 to 20 sec and compressor shuts off. Acting like something is plugged.
Freon charge good.
Tech replaced TXV = no change.
Replaced reversible drier=no change.
Replaced reversing valve=no change.
We are stumped!
model #GSUF0721AA1L120T serial#W95K34650 TRANE installed 12/97 scroll compressor.
Closed loop 6@600ft. pipes filled with distilled water/antifreeze.
Tech is a wonderful guy. Told me he is not charging me for labor and will discuss parts cost with owner since problem hasn't changed. He has about 6 hrs into it so far.