Top-Vent Gravity Wall Furnace Model Numbers. Installing Your Wall Furnace. DO NOT convert the furnace from natural gas to L.P. gas or from L.P. gas to natural. REPLACING A THERMOCOUPLE: a furnace repair anyone can do. the gas on in the furnace. After you locate the thermocouple, turn off the gas to the furnace. To install a gas furnace thermocouple, turn off the gas and power, access the thermocouple through the access panel, remove the old unit, install the new unit and. Installing A Gas Furnace Thermocouple Installation![]() How do you install a gas furnace thermocouple? The thermocouple on a gas furnace acts as a shut off valve for the gas flow, and if it fails, the furnace is unable to light. To replace a thermocouple: Turn off the gas and power. Before attempting to perform any work on the furnace, turn off both the gas and the power to the furnace. Access the thermocouple. Remove the front panel on the furnace to access the upper and lower access panels. Remove the upper panel to access the thermocouple, which is located next to the pilot light. Disconnect the thermocouple. Unscrew the copper lead and remove the connection nuts on the gas line and the thermocouple tube. Clean and dry the connection parts surrounding the area before installing the replacement part. Replace the thermocouple. Purchase a compatible replacement thermocouple and set in place with the copper tube pointing down and the steel tub pointing up. Connect all of the nuts to their proper positions. Turn on the gas and power. Ensure that the new thermocouple is working properly by turning on the power and gas and relighting the pilot light. Ensure the pilot light remains lit, and then re- install the panel door.
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October 2017
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