How to Install a Thermocouple in a Fireplace

A thermocouple is a heat-sensitive safety switch used in many gas appliances, including fireplaces with gas burners. The thermocouple sends a signal to the gas valve to open when the pilot reaches a certain temperature. This lights the burners in the fireplace. With many gas fireplace models, the thermocouple works in tandem with the ignition control, which must be pressed in the open position for 30 seconds or more before the burners will light. If the thermocouple wears out, the fireplace will not ignite.

Screwdriver

Instructions

- 1
  Switch off the control knob for the fireplace to shut down the unit, then close the gas valve on the pipe connected to the fireplace. Turn the valve lever 90 degrees clockwise to shut off the gas. Wait for the fireplace to cool.
- 2
  Loosen the two screws holding the ends of the thermocouple, which is a copper wire with a cylinder in the center. The part is positioned between the L-shaped tube for the pilot light and the gas valve.
- 3
  Take out the thermocouple by sliding the hooked wire on each end from under the screw.
- 4
  Install the new thermocouple with the hooked wire on each end below the screw head. Tighten both screws with the screwdriver.
- 5
  Turn the lever on the gas valve counterclockwise so it is parallel with the hose.
- 6
  Press the control knob on the fireplace and turn to the "Ignite" position while continuing to hold in the knob for at least 30 seconds until the burners ignite. Release the knob and dial it to the desired heat level.

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