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Left hand thermocouple - Water Heaters

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Left hand thermocouple is for propane heaters.
Look at label on side of tank for brand and model number, then contact manufacturer for parts.
http://waterheatertimer.org/Water-heater-manufacturers.html

Posted on Oct 28, 2012

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1 Answer

I replaced the thermocoupler and it still will not stay lit.


is the tip of thermocouple in the flame of the pilot.
where the thermocouple screws into the control valve you just tighten it hand tight and then 1/16 of a turn. or you might have damaged the magnet.
is the flame big enough on the pilot light as it might need the jet cleaned.
failing all that then the magnet in the controle valve where the thermocouple screws in has failed and needs replacing if your model will allow.

Sep 28, 2016 | Whirlpool 6th Sense 40-Gallon 6-Year Tall...

1 Answer

How to replace thermocouplr


below are 3 links to YouTube videos on how to change the thermocouple on a hot water heater, on the first 2 the guy removes the whole burner unit, the 3rd the guy replaces just the thermocouple.
the 1st & 3rd are standard heaters the 2nd is with a sealed Combustion Chamber
when I've replaced mine I just replaced the Thermocouple, but it is a little tight to get your hands in the small space.
https://www.youtube.com/watch?v=xGQngzqrIEE
https://www.youtube.com/watch?v=jDvo4yJ1OdE
https://www.youtube.com/watch?v=itTsykJQYzA


Aug 25, 2014 | Whirlpool Water Heaters

1 Answer

How to replace thermocouple in 42v50-50f


Copy following link:
http://waterheatertimer.org/How-to-replace-thermocouple.html

Rheem 42V50-50 is ordinary atmospheric-vent gas water heater with mechanical (non-electronic) gas control valve, which says that unit has ordinary thermocouple, and not thermopile.
Buy generic thermocouple from local hardware.

To replace the thermocouple you need to remove entire burner assembly from water heater, and have replacement Burner access door gasket on hand. 1-800-268-6966
Combustion door held in place with tamper-proof screws

Since the water heater problem may be more complicated than just the thermocouple, and water heater flame arresor screen may need to be cleaned, and burner parts cleaned, door gasket replaced, and gas pressure checked, and piezo electrode checked, it might be best to have qualified service technician do the work for $300.

Jul 28, 2012 | Rheem Water Heaters

1 Answer

How to change bad thermocouple on reliance gas hot waterheater reliance 606


it is important to turn off

the gas supply to the water heater at the manual gas shut-off

valve. This valve is typically located beside the water heater.

Note the position of the shut-off valve in the open/on position

then proceed to turn it off.

2. On the lower front of the water heater locate the combination

gas control valve/thermostat. Depress and hold

the lock tab located under the gas control knob on the right.

Rotate the gas control knob on the combination gas control

valve/thermostat clockwise until "OFF" aligns with the mark on

the front of the gas valve. Once the gas supply has been shutoff,

remove outer door. 3. Using a 1/4" nut driver or socket loosen the two screws securing

the manifold door assembly until they are free. Do not

totally remove the screws and plastic retainer washers from

the manifold door. The screws and retainer washers will be

needed to reattach the manifold door. 4. In this step, the thermocouple, manifold tube, pilot tube and

igniter wire will be disconnected from the combination gas

control valve/thermostat. Using a 7/16" wrench

disconnect the thermocouple (left-hand thread) and pilot tube

(right-hand thread). Using a 3/4" wrench disconnect the manifold

tube (right-hand thread). Carefully pull the igniter wire from

the igniter button.

5. Grasp the manifold tube and push down slightly to free the

manifold tube, pilot tube, and thermocouple from the combination

gas control valve/thermostat. when installation is complete and gas is back on, You should be able to relight the pilot and the functionality of your gas hot water heater should be restored.

Nov 27, 2010 | Reliance Natural Gas Water Heater Control

1 Answer

Will not stay on geep going out


Will pilot lit then burner and after it does this with just pilot on is that when it goes out. If this is what is happening ,pilot going out,then I would first change thermocouple. The thermocouple is usually on the bottom left hand side of gas valve.It will look like copper wire about as thick as a pencil lead. Remove burner cover and trace thermocouple line to where it mounts on pilot light assy.Thermocouple should be held in place by friction.Remove thermocouple from gas valve by lossenjng retaing nut,reach in burner compartment and grasp thermocouple at base.using small amount of force pull thermocouple from pilot assy and remove.You can get anew one at most hardware stores. Try to get one close to the length you have. A little longer ok. shorter no.Reinstall being careful when you tighten thermocouple nut as it is made of brass and valve body is made of aluminum.Very easy to cross thread or overtighten and strip threads. Make sure thermocouple is properly plased by pilot. Light piloy and hopefully this will tke care of it for you. THANKS

Nov 14, 2010 | Reliance Natural Gas Water Heater Control

2 Answers

How do I install a thermocouple in a hot water heater


Normally mounted on a bracket held in place with a spring clip OR a phillips screw.

Slip the out the old - insert the new. Light it up and enjoy

Oct 14, 2009 | Water Heaters

1 Answer

The pilot light has started going out and it has happened 3 times over the last two days. The Reliance phone rep says we need to get a new pilot light unit and install it ourselves. The heater is on 13...


your thermocouple is getting bad and shuts off the gas supply for safety,normally the thermocouple and the components come as a unit just repl all its easy with a few simple hand tools

Oct 07, 2009 | Water Heaters

1 Answer

How do i replace the thermocouple rheem coppermatic model 77/115l


shut the gas off, remove all three lines off the bottom of the control box and pull them out of the control box. then you should be able to remove the whole burner assembly. if it's sealed combustion unit you will have to remove 4 nuts around the faceplate to get the burner and flash guard out. then get your new thermocouple and throw it on and put it all back together. just hand tight on the lines going into the control box you dont need to kill it. and walla your all done!

Aug 02, 2009 | Rheem Water Heaters

1 Answer

The pilot light on my gas water heater continually goes out. I can re-light the pilot and get it going. The gas burners goes on runs for awhile. I'm assuming when that when the temp hits the desired temp...


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The pilot assembly should look similar to the pic above. Depending on where you live, you may be required to hire a certified plumber to replace the parts. If not you can do it your self. Keep in mind if it's not staying lit you also need to check the thermostat and the thermocoupler before replacing the pilot assembly. There is a good chance it is just the thermocoupler going out. It is one of the first things to check when troubleshooting a pilot light problem with a gas water heater. A thermocouple determines if the pilot light is lit. If it's not lit, the gas valve fails. If that's the problem, replace the thermocouple.


  1. Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
  2. Step 2 Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
  3. Step 3 Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
  4. Step 4 Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
  5. Step 5 Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.

Jul 09, 2009 | Northern Tool Water Heaters

1 Answer

Water heater pilot light won't stay lit


Only thing left to change is the gas valve assembly.

Jun 15, 2009 | Rheem 36" Water Heater Thermocouple Kit

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