I went to check a Goodman heat pump in Virginia. Customer complaint was she would set the thermostat for 62 and when she would come home from work the thermostat and temp was reading 80 and still running. I checked the low voltage at the outdoor unit and the thermostat was still calling for heat. I noticed and added on time delay relay on the condensor. I changed the thermostat out with a new honeywell progamable one. 4 days later the customer is calling back saying its still running she has it set for 62 and its 77.
I went back over to customers house today. I looked at the indoor unit, it was an old 82 GE model, no control board, just relays. The problem seems to be intermittent. I checked for continuity between the red low voltage wire and all the others, no direct short. I turned thermostat to heat and turned it up, I went to the indoor unit and wiggled all the control wiring. The indoor fan motor turned off, the outdoor continued to run. I cut approx 2ft of control wire off, for both the thermo and outdoor. I stripped the 2 ft of wire to look at its condition, it looked in good condition. rewired it all and let her run. Not sure if its going to fix it. i may just have to replace all the wire. i guess the heat strips could have a relay stuck and maybe a contactor in the outdoor is also sticking. Anyone have any ideas?
any ideas? thanks fellas in advance.