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Why is my furnace turning on even though my thermostat is selected to cool?

rgaila
Community Specialist
Community Specialist

Disclaimer: This thread was migrated from our previous version of the Google Nest Community. You can continue to receive updates on your thread issue here or simply ask, browse or more in the new Google Nest Community.

Original Poster: Laura Hendrick 

Within the last couple of months, my Nest E thermostat has started to switch from Cool to kicking on the furnace during the day. There is no specific time when this occurs, so whenever I call HVAC support, they can't help because aren't there when it starts up. I already verified/cleared the schedule to ensure the settings are correct.

 
When I turn it off for awhile (several hours), I am then able to turn the Cool back on. 
 
Can anyone assist?
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