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I have a downdraft model MGH-065AACWN-06, and am having trouble replacing the thermocouple. I tried removing the gas valve, but when I went to undo the burner, the burner tube started to turn, and I was concerned that it might twist and get distorted or damaged. Is there an easy way to change the thermocouple through the round port at the bottom of the unit, or am I just being too gentle in taking things apart?

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SOURCE: 1990 Triple E mobile home

I've a similar problem and a new thermocouple solved it

J. N. Millet, Alberta

Posted on Jan 14, 2011

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I have a Coleman Presidential II Model #3118A751, it went out. What parts do I need? can it be fixed?


If it is a 'standing pilot' furnace and it just 'went out'...I would think you need to try to re light the pilot light. If it doesn't re-light, it is probably time for new thermocouple. Presidentials are very tricky to install a thermocouple on if you are not experienced with it or if you don't feel comfortable working with gas and electricity.

Probably should call a local 'handy-man' at the least to perform the task or a local HVAC service company.

There should be a series of phillips head screws around the perimeter of a large access panel on the front of the furnace. You'll need a 3/8" wrench for the thermocouple connection to the gas valve and a 7/16" wrench to remove the 'pilot' line off of the gas control. Look for how the pilot assembly mounts under the pancake style burner because its much easier to remove the whole pilot assembly to replace the thermocouple than just it by itself. Once removed, it is self-explanatory as to replacement of the thermocouple.

Do NOT overtighten the thermocouple connection into the gas valve as you can damage the gas valve by doing so. Make sure you leak test the pilot tube connection after it is reconnected to the gas valve. A diluted solution of dishwashing liquid dashed around the ferrule of the pilot line should show bubbles if there is a leak. No gas will be in that line unless the pilot button is depressed and/or the pilot light is lit and burning.

Jun 18, 2015 | Coleman Heating & Cooling

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Looking for a gas valve for a intertherm furance model no. mgh-055aacwl-06 ser.number mgh9009-00077


you need to contact your nearest a/c supply house. most company's that sale parts on line will not sale gas valves to the public due to liability.

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I need Help Replacing A thermocouping on a wall heater


Thermocouple run from side of the pilot to the gas valve cooper tube brass nut by the pilot and grey nut on gas valve undo these nuts remove thermocouple at both ends and fix new

Nov 02, 2012 | Heating & Cooling

2 Answers

How do i adjust or take out the thermocouple?


follow the copper wire to the gas valve undo the silver nut follow the thermocouple copper wire to the pilot undo the brass/ silver nut on the pilot replace thermocouple the same way.

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I have a Rheem PG50T9A gas hot water heater. We had hot water this morning. When I came home the pilot light was out and won't stay lit. Any ideas?


Hopefully just the thermocouple. The thermocouple is the small rod right next to the pilot light. The flame on the pilot heats up the thermocouple and keeps the gas valve on. You can replace it yourself. The thermocouple will be connect by a small nut on the underneath side of the valve, and you will have to pull the thermocouple out of the pilot assembly. Not an expensive part, you can get it at any hardware store. Hope this helps you .

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1 Answer

Pilot light will not stay lit. I have tried holding the button down for 1 min, 2 min, 3 min and once the button is released the flame goes out


Is the pilot light FLAME touching the 'ThermoCouple'?
(This is a little rod-like device, that generates a signal voltage,)
This signal tells the Gas valve that it is safe to let the main gas in to the burner.

This ThermoCouple might be dirty-- or sooted up-
or it might need replacing.

Try cleaning the surface of the TC first--
Then--Try adjusting the discharge of the pilot, so it positively heats the TC

Does that allow the Gas valve to open now?

If you want to try changing out the TC-- take the model and information off from the gas valve, and the heater-- possibly your local hardware will have Thermocouples?-
If not-- yo may have to call a service company-- see if they will sell yo one..

Let me know where you want to go next with this trouble shooting process.

Mack B

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1 Answer

I need to replace a gas furnace thermocouple on a Tempstar gas furnace. How do I do this? Part # SV9500M2682 on Tempstar model # NUG5100BHB2


HI follow the thermocouple lead back to the gas valve undo the silver nut foloow the lead back to the pilot and undone the nut on thermocouple or it may just pull out , or the burner might have to come out to replace it , if you arenot sure on this then a local gas fitter will do this .

Jan 26, 2010 | Heating & Cooling

1 Answer

Rheem 21V40-38 gas pilot will light, but the burner will not come on.


As long as you have a good strong pilot flame under thermocouple in the first place, try this. Shut gas valve off, and clean thermocouple above pilot flame. Best way is to remove it, and clean it with fine steel wool, or fine emery cloth, at both the probe end that sits over pilot flame, as well as undo it from gas valve and rub contact surface on other end with steel wool as well, and if you have any electrical cleaner, give it a squirt in spot where thermocouple was removed from, and clean it out well, and if no electrical cleaner, roll a piece of steel wool up small enough to get it in that hole and twist it on the surface where thermocouple meets, to clean the surface . If that works, great, if not, either thermocouple is defective, or bad gas valve.

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1 Answer

AO Smith water heater about 4 years old pilot went out took out piolt assembly cleaned and was able to relight pilot unit stayed working for about 2 weeks and went out again any ideas?


It sounds like your flame detector (usually a thermocouple) has gotten weak and when you cleaned the pilot the stronger flame was able to generate enough power to keep the gas valve working. If you replace the thermocouple your problem should go away. If a new thermocouple will not keep the gas valve operating...the coil in the gas valve has gone bad and you will need to replace the gas valve assembly. (most valves do not have replaceable coils).

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