Duo Therm Heat Pump weirded out

howardwheeler wrote:
I have a less than two year old Duo Therm Heat Pump that has suddenly started having the compressor run anytime 120 volts is to the unit. Only if I shut off the breaker will the compressor stop running. The fan doesn't run unless I put it in non-automatic mode. I have a five button CCC thermostat. I did lose 12 volt power last night, but the ac worked fine after that. 12 volts are back working now, but the AC compressor runs all the time. It is apparently stuck on heat pump, because when I put the fan on run hot air comes out. It's under warranty but I can't get service to look at it yet and we are using the unit. Any ideas?

Your Compressor Relay on the Upper control board is stuck CLOSED. This is not a replaceable part(the relay). Replace the 5 button upper control board. Your timeline does not make sense. The 5 button has not been used in almost 5 years. Do you mean the Upper HP was replaced less than 2 years ago? If so, then the upper board was not replaced when they changed out the unit(you do not unless it was bad). Doug