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== Thermal Coupler ===== How to Install a Gas Furnace Thermal Coupler ===If the pilot light on a gas furnace will not stay lit the problem may be with a part called the thermal coupler. The thermal coupler is screwed into the gas control valve and has a thin wire which sets in the flame of the pilot. If there is no pilot light burning the thermal coupler tells the gas valve to shut off the gas supply. # Locate the shut off valve on the gas line which goes to the furnace and shut it off. # Locate the thermal coupler on the furnace. Look at where the pilot light is and trace the wire that sets in the flame of the pilot back to the gas control valve. # Unscrew the nut which attaches the thermal coupler to the gas control valve. Remove the old thermal coupler and take it to the hardware store to make sure the right size replacement thermal coupler is purchased. # Tighten the nut by hand which holds the thermal coupler onto the gas control valve. Use an adjustable wrench to tighten the nut the rest of the way.# Place the wire end of the thermal coupler in the pilot the same way as the old thermal coupler. Usually only about the top 1/3 of the thermal coupler wire should be heated in the pilot light.# Turn on the gas supply and re-light the pilot.