Had probs last week with my Goodman A/C heat pump purchased new in 2005 (5 ton unit). Diagnosed initially as bad compressor/condenser circuit board, replaced that to no avail, next diagnosis, bad compressor, replaced that to no avail, next diagnosis bad reverser valve. Replaced that this past Thursday and it worked fine for two days until today when the whole unit froze up.
Regards the compressor, it too was a 48000 btu unit in a 5 ton a/c and Goodman says, I guess, that is the correct configuration (at least that's what the techs said). So the techs put all the new stuff in (board, compressor, then reverser valve) and it works for a couple of days and then totally froze up today. So my question for all is could the potentially undersized (though not according to Goodman) compressor be the cause of the freezing up of the expansion coil and lines or what might your thoughts be?