How to check if power is getting to my thermostat?

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How to Check If Power Is Getting to My Thermostat? 1 Check the circuit breaker. Go to your breaker box and look for the breaker that powers the furnace or air conditioner. 2 Check the power switch. There is power switch on the side of the HVAC unit. … 3 Change the batteries in the thermostat. … 4 Test the power wire to the thermostat. …

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