Gmp100-4

Unregistered Ed

My Goodman GMP100-4 may turn on mid-day and blow cold air for some time, maybe an hour or more, even when the heat switch on the thermostat is turned off. Generally though, it stays on for a long time, an hour or more after the burners have turned off. I had a Sears’s technician out, and he couldn’t pin point a specific cause. He recommended a filter change cause, and it seemed to solve the problem. On a follow-up a couple of months later, same deal.

Something has failed though because this happens now and again most of the time - burner comes on, fan starts after a minute but remains on after the burners have shut down indefinitely. Clean filter. What do I tell the next tech? What part needs to be checked and ,or, replaced?