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How Do I Bypass My Thermostat to see if the Thermostat is Bad?

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Problem: My air conditioner or furnace will not work. Is there a way to test the thermostat to see if the thermostat is the problem? Can I bypass my thermostat to see if the thermostat is bad?

Answer: We have this question asked many times. The first thing that I would like to suggest that you do would be to make sure that if your thermostat uses batteries to make sure the batteries are in good condition. Also, make sure that the power switch on the side of the furnace is turned on. We have seen many preventable service calls where all our customers had to do was flip the power switch on the side of the furnace! With the furnace door’s safety switch taped down and with the furnace’s power switch turned ON use a voltmeter set to “Volts AC” and test between R and C (com) terminals on the furnace’s control board. You should get 24 to 28 volts AC (alternating current) between R and C on your furnace’s or air handler’s control board. If you are not getting 24 volts AC then you might have a blown fuse on the control board/transformer or a burnt-out low voltage transformer. We sell low voltage transformers on the following page: Please click here to see the low voltage transformers we sell. 

If everything checks out on the low voltage side then you can test to see if the thermostat is at fault by bypassing the thermostat. Bypassing the thermostat is a great way to troubleshoot the thermostat to see if the thermostat is at fault. We have a really good YouTube video from Word of Advice TV that explains in detail how to bypass the thermostat to see if the thermostat is bad. Thanks so very much to Word of Advice TV for making this informative, excellent video. If you have any questions please email us anytime. Our email address is  If you would like to comment then please feel free to comment in the comments section below. We Would Love to Help You Out and Earn Your Business! 

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