Problem: The fuse on my gas furnace’s control board blows constantly. How do I find a low voltage short?
Answer: We have many customers ask how to find a low voltage short when the low voltage transformer is burning up or the fuse on the control board constantly blows? Most of the time I have found that shorts occur in the thermostat wires that go out to the outdoor condensing unit. Wear and tear of sunlight, animals or weed eaters usually cause these shorts. I would like to suggest that you inspect the thermostat wires for cracks, wear and tear. Pay close attention to where the thermostat wires go through the body of the furnace or air conditioning unit. Many times the thermostat wires will short out against the body of the furnace or air conditioner. The vibration of the furnace against the sharp metal body of the furnace can tear through the thermostat wire insulation and cause a short in the wires. We have a really good tool that you can use to save fuses when troubleshooting low voltage shorts called the Lil Popper. The Lil Popper allows you to manually reset the fuse instead of replacing a fuse every time. Please click here if you would like to see the LiL Popper tool we sell. If you find out that your low voltage transformer is bad and you need a new transformer then Please click here to see the low voltage transformers that we sell. I found three really good Youtube videos on how to find low voltage shorts by ACservicetech, Word of Advice TV, and Lex Vance. I hope these great Youtube Videos will help you out in finding where the short is located in your HVAC system. The Lex Vance video on the bottom shows how Mr. Vance found a low voltage thermostat wire short out in the AC condensing unit’s thermostat wires. Thanks so very much to ACservicetech, Word of Advice TV, and Lex Vance for making these great videos! If you have any questions please email us anytime: firstname.lastname@example.org or comment below in our comments section below. We Would Love to Try and Help You Out and Earn Your Business!
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