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How To Clean A Thermocouple

How To Clean A Thermocouple

If you are asking questions like "How do you clean a thermocouple?", chances are you are not the average fireplace owner. Some people have trouble pronouncing that word, much less learning how to maintain it. So, this article will not be basics about cleaning a gas fireplace. This is an in-depth look at gas fireplaces, their parts, and how to maintain them. If that sounds like something you need, keep reading, we promise to make it as pain-free as possible.

How To Clean A Thermocouple

Many gas fireplaces use a standing pilot or millivolt valve as a part of the way they ignite the main burner. Though it might seem like a magic fairy sits behind the wall switch connected to your fireplace and that is what makes the fire roar to life... sadly, that is not the case. A small probe called a thermocouple, or thermopile is heated through a small standing flame.

About the Author

Collin Champagne

With over 13 years in the industry, Collin is a National Fireplace Institute (NFI) certified technician and managed content for the eFireplacestore and eCanopy brands. He has achieved the highest NFI certification possible as a Master Hearth Professional and is certified in all three hearth appliance fields: wood, gas, and pellet. With experience with sales and in-field installations, his expertise shines through his technical knowledge and way with words.

Customer Q&A with Product Specialists

Joseph Y. from TN asked:
My pilot light is working perfectly.  I can finesse the burner to light, but only for a moment, and the pilot goes out, and then the burner stops working. I have clean out all the lines and fittings. Could this be the thermocouple? Is there a way to bypass the test?
My pilot light is working perfectly. I can finesse the burner to light, but only for a moment, and the pilot goes out, and then the burner stops working. I have clean out all the lines and fittings. Could this be the thermocouple? Is there a way to bypass the test?
Your thermocouple is possibly not recognizing the pilot flame, which is causing it to go out. You will want to clean the thermocouple with a piece of emery cloth or high grit (1000) sandpaper. This may resolve the issue. Another issue that could be causing this is the connection point between the thermocouple lead and the gas valve. Depending on your fireplace, there may be either a pair of lead wires or a solid copper lead that is held in place by a nut. Either way, loosening and cleaning the connection point at the gas valve will often make a difference, as excessive voltage drops can occur at this location and cause the pilot to drop out.  If that does not work, you can use a multimeter to test the millivoltage to see if there is an issue there.
Answered by: Tyler M. on Jan 11, 2024

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