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The furnace I have does not turn on, the gas is on and the guy that turned on the gas relit the pilot and said it didn t stay on, and that he thought i needed a new thermal coupler. i know nothing about furnace stuff and was wondering if this is something I can do, and how to do it. I am fairly handy around the .Buy today ships today. Original, high quality Thermal Coupler Parts and other parts in stock with fast shipping and award winning customer service..How to tell when thermal coupler does not work and what to do test a thermal coupler testing a thermocouple..