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Remove the Old Thermocouple — Replace the Thermocouple

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How to Troubleshoot a Gas Water Heater That's Not Working · Step 5 of 6

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In this video

Since cleaning did not solve the problem, the thermocouple must be replaced. First, remove the small metal clip that holds the various wires together on the burner tube. Next, pull the old thermocouple straight out of its mounting bracket near the pilot. It is held in by friction and a small clip. Use a utility knife to carefully cut the old rubber grommet on the access plate to completely free the old thermocouple wire. Finally, use pliers and a flathead screwdriver to pry off the old clip that held the igniter and thermocouple together.

Goal: Completely remove the faulty thermocouple from the burner assembly.

Used in this video

  • Pliers — Gripping and prying off the old retaining clip.
  • Flathead Screwdriver — Prying off the old retaining clip.
  • Utility Knife — Cutting the old rubber grommet to remove the thermocouple wire.
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FAQs

What are the most crucial safety precautions I need to take before troubleshooting my gas water heater, especially regarding gas leaks?

Always prioritize safety when working with gas appliances. Before starting, ensure adequate ventilation, and if you smell gas, immediately turn off the gas supply, evacuate the area, and call your gas company or a professional plumber. Never attempt to troubleshoot if you suspect a gas leak; this project assumes no active gas leak.

What specific tools and materials are essential to have on hand before I start troubleshooting my gas water heater?

You'll definitely need a reliable flashlight, like the Panther Vision FLATEYE, to inspect dark areas. For cleaning connections, fine-grit sandpaper (e.g., Fandeli 400 Grit) and a scour pad are useful. If you suspect a faulty thermocouple, have a new resideo 30 Millivolt Universal Gas Water Heater Thermocouple ready, along with an adjustable wrench set for replacement.

My gas water heater isn't producing hot water; what's the most common and easiest issue for a beginner to check first?

The most frequent cause of a gas water heater not producing hot water that beginners should check is a pilot light that has gone out. This is often an easy fix, requiring you to relight it according to your water heater's instructions. If the pilot light won't stay lit, the thermocouple is the next most common culprit to inspect and potentially replace.

How much time should I expect to spend on this troubleshooting project, and what's the potential cost if I need to replace parts?

Most troubleshooting steps, like checking the pilot light or cleaning the thermocouple, can be done within 30-60 minutes. If you need to replace the thermocouple, it might take an additional hour for purchase and installation. A new thermocouple (like the resideo CQ100A1013) typically costs around $15-$30, making this a very cost-effective DIY repair compared to a professional service call.

Transcript
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So onto the next step we're gonna replace that thermal couple All right, so that's the thermal couple right there It's just held in by clip Just squeeze that clip but first thing you want to loosen the wires first All right, so like I said it's just sewn in by that clip you could try to pull it out And that usually works, but I need two hands for this So hold on pull out all right. I got it out That's what it looks like We're gonna take off that clip so we put the new clip in First we need to cut this part right here. Just make a cut And pull the whole thing out just like that. That's the old part Here's a new part right here It comes with a new clip, but first we need to take off that old clip Just squeeze it with some flathead and pliers. That's what I did And then once you get it right there you can pop it off and then no one just pop right in

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