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C wire power

Mikel1978
Community Member

‎12-27-2021 01:29 PM

I replaced my Honeywell digital thermostat with a Google nest. There are white, yellow, red, green, and blue (common wire). I have properly wired my Google nest, but for some reason is saying that I do not have power to the C wire. First of all, there is a C wire connected, and I have verified that it is connected to the C wire on the control board on the HVAC unit. Help??

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johnCNA
Bronze
Bronze

‎12-27-2021 08:05 PM

Best thing to do at this point is to get a basic multimeter and check the voltage between R and C at the thermostat terminals.  You're looking for approximately 24v AC.  Most furnace control boards have a separate fuse just for the 24v circuit.  Mine is an automotive type fuse - easily pulled and replaced.

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