Water heater thermocouple buyers guide, troubleshooting, repairand step by action replacement guide.

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Thermocouple replacement is a an easy process. If your handy with tools girlfriend shouldn"t have any type of problems.

Go come thermocouple parts page.


Thermocouple Buyers            Guide

Standard style

Also referred to as universal water heater thermocouple. That screws right into thebottom the the gas valve and also a probe top top the other end slides right into a stop bracket near the pilot light. The looks like a piece of copper cable ( view pic. Below).

This thermocouple has a ideal handed thread. Turn right to tightenleft to loosen. Universal thermocouples come in lengths from 15 to 36 inches. An 18 or 24 inch will suffice for every residential water heaters using global kits.

Almost all older waters heaters and many of the newer layout unitswith a sealed burner compartment and also a viewing window will use thisthermocouple.

If you want to use an exact replacement length simply remove your old one and measure it.

TCO style

Thermal reduced Off style has a resettable thermal shut turn off switch integral right into the thermocouple. In the occasion of a flash fire or blow ago from the burnerthe TOC will shut down gas circulation to the burner and pilot.In situation of a shut down the TOC must reset chin after it cools downand permit you come relight the pilot.The TOC switch looks prefer a clock battery.You will certainly only find the TOC top top newer layout water heaters through seal burnercompartments.

TOC non-resettable style

These thermocouples have a tiny TOC develop inside the tube. Lock looksimilar come a typical one other than the diameter is larger around midwaysof the tube.When this TOC"s switch turn off they will certainly not reset and also must it is in replaced.

Whirlpool Water Heater Thermocouple

Some the Whirlpools older version water heaters were developed with a left-hand object thermocouple. Turn come the left to tighten, right to loosen. These space no longer available.

Lowe"s home improvement sells a Manifold Door Assembly because that Whirlpoolwater heaters. The comes through a thermocouple attached. Cost is about$35.00. Your website Lowes.com

You can likewise purchase one directly from Whirlpool at around the sameprice. Your costumer company number 1-866-698-2538.

this water heaters were built by American Water Heater Co. Castle havea many "how to" replace components guides for your water heaters. Followthe link below.

American Water Heater Co.

How thermocouples work

A pilot thermocouple sends a small electrical present to the gas valve as soon as the probe is heated to a specific temperature.This electrical present tells the gas valve the the pilot is lit and also its ok come send gas to the burner if the thermostat calls for it.

To inspect a water heater thermocouple push the pilot button down ~ above the water heater gas manage valve. Irradiate the pilot. If ~ holding the pilot button down 30 come 60 secs the pilot irradiate goes out as soon as you relax the button, the thermocouple is most most likely at error on olderunits. The TOC or air flow could be the difficulty on newer units with a pilot light viewing window .

If the pilot does no light at every the problem is gas flow, gas manage valve, TOC tripped.

The most common thermocouple problems

The pointer on the thermocouple probe has deteriorated.Lack of wait (oxygen) on seal burner water heaters.

Thermocouple Repair

If the probe watch white this is carbon develop up. It have the right to keep the probe from gaining hot sufficient to send a signal to the gas valve. Sand it with emery cloth and relight the pilot. It need to work for a while yet keep a new thermocouple handy.

The thermocouple probe should be in the pilot light flame.

The thermocouple need to be screwed into the gas valve tightly.

Check the pilot thermocouple tube for kinks.

Water heater thermocouple replacement

Thermocouple replacement is a simple process. If her handy through tools you shouldn"t have any problems.Always follow all safety and security rules when working approximately gas.

A universal water heater thermocouple deserve to be uncovered at many hardware stores.

In the guide listed below I"ve gotten rid of the burner assembly for this reason you have the right to see just how the thermocouple is positioned alongside the pilot.

How To replace A Thermocouple


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The pic top top the left is the waterheater burner assembly removedfrom the water heater.

The thermocouple is located next come the pilot head.


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Turn the gas off to her water heater.

Set the temperature manage knob(on the gas control valve)to the shortest setting.

Turn the on/off pilot control knobto the turn off position.

Remove the outer and inner burner assembly access panels.

Remove the thermocouple native the gas control valve utilizing a 3/8 in.end wrench (see picture above).

Reach right into the burner compartment and also pull the thermocouple out ofits holder.A tough tug have to do it.

If girlfriend can"t traction it out, skip the next step and also scroll down this page forinstructions to eliminate the burner assembly.


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Got the thermocouple out? Good.To install the brand-new one, use a flashlight for this reason you can see andslide the probe right into place.

The reminder of the probe should be 1/8 to 1/4 in. Pass the pilot head.

Attach the other finish to the gas manage valve.

Remove the Burner Assembly


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Ok, you"ve disconnected thethermocouple indigenous the gas controlvalve yet can"t get it freed indigenous theburner assembly.

You"ll have to remove the water heater burner.

Using a 7/16 in. End wrenchdisconnect the pilot supply tubefrom the gas manage valve.


eliminate the burner assembly fromthe water heater.

Now you have the right to remove the thermocouple through a pair that pliers.

Slide the new water heater thermocouple right into place. Positionthe reminder of the probe 1/8 come 1/4 in. Pass the pilot head.


Reinstall the burner assembly

Be sure that the end of theburner assembly fits right into the slotthat holds the in place (see picture).

When your finished check allconnections for gas leaks.

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With her water heater thermocouple and burner assembly installedyour prepared to irradiate the pilot light.