We have a Goodman heat pump. The furnace began to act up when we turned the heat to emergency heat (temps were getting in the teens). The emergency heat would not shut off and the temp in the house got to about 77 (thermostat set on 68). Finally, it shut off and we turned it back to regular heat. Since then the furnace has run pretty much all the time.

Is there a sensor or timer or relay (just guessing here) that could be a problem? The heat pump is less than 3 years old. Thanks for any suggestions.

Possible bad tstat,,