- 1). Shut off the heater at the control knob on the appliance, then turn the knob in the gas line connected to the heater clockwise until tight.
- 2). Open the access cover on the heater, using a screwdriver to remove the screws holding the cover in place. The thermal coupler is between the pilot light tube and the valve for the gas. The coupler has a wire on each end with a bulb in the center. The bulb is typically made of copper.
- 3). Loosen the screw holding the wire on each end of the thermal coupler. Take out the defective part.
- 4). Slip the hooks on the end of the new thermal coupler wires around the threaded screws. Tighten the screws.
- 5). Close the access cover on the appliance and secure it with screws.
- 6). Unscrew the knob in the fuel line connected to the heater, which can now be ignited normally.
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