The one time I worked on a Trane heat pump, it looked clean as can be. Just
for good measure, I gave it some alki foam on the condensor coils. Wait a
while, rinse it off. Repeat to see if anything visible happened. I didn't
get the good white foam I usually get with window AC. Fired up the unit, and
the amperage had dropped about an amp.
This was about a year ago, don't have all the numbers, pressures, and so on.
But, cleaning the condensor never hurts.
Buzzing. Well, could be main contactor. Makes me wonder if the reversing
valve is operating, to throw the unit into defrost? Just don't know, not
there to see.
Rising indoor temps while under load sounds like either low charge, or a
dirty coil. Indoors or out. More likely outdoors.
Please let us know how things work out.
Christopher A. Young
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