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Heating unit kicks circuit breaker
We have a Ducane heat pump unit. It was installed new 4 years ago. This year, we didn't use the air conditioning, just didn't get unbearable enough, so hadn't used it since last heating season. This heating season, the thermostat COVER get warm, making the temp. go up for room temp, so we had to kick the furnace temp "call" up to make the furnace turn on. The furnace will run a few minutes, then kick the circuit breaker. When the circuit breaker kicks, the temp on the thermostat will read the proper room temp and the thermostat cover is cool. we keep turning the circuit breaker back on until the house gets warmer, but when the furnace turns off "normally" then the thermostat cover heats up again, making a "false" room reading and the whole thing starts all over again. It usually goes up to upper 80's, when the house temp is really 60's to lower 70's. What could be wrong?