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Thermostats not triggering furnace

Community Member

My HVAC is only 2 years old as is my thermostat. All of a sudden when I set my temperature for heat, it doesn’t want to come on. Ive checked the gas and all other connections and everything seems to be working. It will randomly decide to turn off and on when it wants to. Like right now, it’s set at 76, shows it’s 70 in the house and 2+ hours and it refuses to turn on no matter what I do! Help!