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Heats turns on while termostat is on cool

Community Member

Heats keeps turning on while termostat is on cool, when temp is reached, termostad turns the heater on to raise temp one degree 


Community Specialist
Community Specialist

Hi Rmorell, 


Oh no! I'm sorry to hear that your heat keeps turning on while termostat is on cool and raises temperature to one degree. Let's see what's going on. A few questions: 


  • Are you located in North America or Europe? 
  • What type of Nest Thermostat do you have?
  • Is the Nest thermostat newly installed?
  • Does the thermostat screen indicate that it’s actively calling for heating?
  • What type of furnace do you have? (gas, electric, etc.)
  • When did heating last work?
  • Did heating ever work with the Nest thermostat?
  • Did you turn off the power to the HVAC system?
    • Did you recently turn off any breakers?
    • Have you recently experienced a brownout or blackout?
    • Is there a light switch near the heater that controls an outlet?
  • Did you select the correct fuel type?
  • Do the LED lights blink on the HVAC control board? If yes, locate the light.
  • When was the last time you changed the furnace's air filter?
  • Have you experienced extremely cold weather lately?
  • Is this the first notable temperature drop of the year in the area?


I'll look forward to your response.