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Nest randomly runs furnace when calling for AC.

Community Member

I have an issue with my 3rd gen nest learning thermostat and Goodman forced air furnace/ air conditioning system. 

My system will randomly turn on the furnace and run flat out. Even when the thermostat is calling for AC. This has happened multiple times and I’ve had the unit serviced and inspected by a reputable HVAC company. 

This issue has happened mostly during the summer months, the system will call for cooling and randomly the heat will kick on. This also happened in the winter where the heat came on and ran flat out surpassing the set limit of the thermostat. We came home to a 85 degree house one day because the heat was running nonstop. 

Any ideas?




Community Specialist
Community Specialist

Hello goodmanFurnace,


Thanks for reaching out here in the Community. To confirm, do you have a heat pump system? Were you able to check the power reading? Could you please share here the diagnosis of your HVAC technician? So that we could take a closer look at what's happening. Looking forward to your response.




Community Specialist
Community Specialist

Hello again,


I wanted to follow up and see if you still needed help. Please let me know if you still have any concerns or questions from here, as I would be happy to take a closer look and assist you further.


Kind regards,


Community Specialist
Community Specialist

Hey there,


We haven't heard from you in a while, so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.