How to replace thermocouple on gas fireplace. Once the nut is loose pull the end of the thermocouple through the mounting plate. To replace a gas fireplace thermocouple shut off the gas and electricity remove the access panel disconnect the pilot gas tube and then remove and replace the thermocouple. To find a replacement thermocouple consult the owners manual take measurements of the existing part or take the part into a hardware store to find a replacement.
With gas and flames involved things can get dangerous as in blow your house up dangerous. Place the new thermocouple in the same place your old one sat and close up the fireplace to conduct a test. Give the thermocouple about 15 minutes to heat up and then turn on the flame to make sure it all stays functioning.
The thermocouple on your gas furnace is a heat sensitive device that transmits a small electrical signal to the gas valve to keep it open when the pilot is on. The thermocouple lasts for 10 years or more and when it fails the pilot wont stay lit and the fireplace wont work. If your gas fireplace isnt starting there could any number of possible issues contributing.
Pull the entire thermocouple out of the heat glo fireplace. Locate the gas valve its usually behind a grill on the front of the fireplace and find the copper thermocouple wire leading from it. First check to see if your pilot light is lit.
So hire an expert if youre not comfortable doing any of this in a safe manner. My gas fireplace wont light.