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STEP 8
If nothing is working.
Check to power to the HVAC system by checking your breakers. If there is an ON/OFF switch on your furnace, be sure it is on.
Check the batteries in your thermostat. Are your batteries Alkaline batteries? Are they fresh with a high state of charge?
Check the power to the thermostat by using an AC voltmeter.
For heating, with the thermostat off the wall, measure the AC voltage between the RH and the W. It should read about 24VAC (+/- 3V).
For cooling, with the thermostat off the wall, measure the AC voltage between the RC and the Y. It should read about 24VAC (+/- 3V).
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