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I have a presidential II furnace. I can't get the pilot to stay lit once I release the button. I've changed the thermocouple and no luck!!! What else could it be?

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Either the pilot asembly needs to cleaned or the gas valve is faulty.

Posted on Nov 28, 2012

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Posted on Jan 02, 2017

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mrgrzz
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SOURCE: Pilot Light won't stay lit on wall furance

The low voltage wiring and the thermostat has noting to do with the pilot function of the wall furnace, check to see if when you have the pilot lit manually, while holding the button in does the flame impinge on the thermocouple and does the flame try to wrap around the thermocouple? if not the thermocouple and pilot flame need to be adjusted so that it impinges on the TC, if it does have a good flame impingment, then you probably have a bad TC from the factory, call them and have them send you a new one if still under warrenty.

Posted on Jan 20, 2009

tborn6
  • 700 Answers

SOURCE: Rheem furnace RGDG-100AUER - Pilot does not stay on

replacde the thermocouple and you should be all right.

Posted on Apr 05, 2009

  • 80 Answers

SOURCE: pilot light will not stay lit on model 465FX-R

It is possible that gas valve is bad, however, try replacing the pilot orifice located in the pilot assembly. If the flame is inadequate it will not generate the voltage required in the thermocouple. Pilot orifices are less than $10 and can be found at your local heating contractor's parts counter. Bring in the orifice to match.

Posted on Oct 03, 2009

billyvangogh
  • 108 Answers

SOURCE: reznor model# f125 pilot won't stay lit. i

Make sure the pilot is clean (Blue flame fully enveloping the top portion of the thermocouple) if its dirty the pilot will be yellow like a candle and barely touching the thermocouple ...quick fix is knock the pilot with a screwdriver...gently tapping it...knocking the dust out and getting a better pilot....the pilot could also be too small if its not making good contact with the thrermocouple....there could also be an Auxillary limit wired into the thermocouple which when open will prevent the magnet from staying closed....if all looks fine then the Gas Valve itself is likely gone (The magnet inside is not field repairable)

Posted on Oct 25, 2009

  • 8404 Answers

SOURCE: i have a older Miller furnace(1989)the pilot will stay lit

Replace the thermocouple.

Try this, do you have a butaine stick lighter? Try to heat the thermocouple with it ... see if you can get the main burner to come on. If not - definitely, replace the thermocouple.

Thanks for your question.

Posted on Jan 04, 2010

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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

1 Answer

I AM WORKING ON A COZY W501E WALL FURNACE AND CANT GET THE PILOT TO STAY LIT. i HAVE CHANGED THE GAS VALVE, THERMOCOUPLE,AND THE SENSOR FOR THE HIGH LIMIT. THE PILOT WONT STAY LIT.


Pretty much the only thing that will do that is the thermocouple not generating enough voltage for the valve to say it's OK.
Usually you need to hold the button for pilot lighting for 60 seconds. You can use a meter to check that it's generating enough power. The thermocouple has to be in the pilot flame properly.

Check this video:
https://www.youtube.com/watch?v=suen7QlJl4o

Gas furnace will not light Thermocouple test with the multimeter

Or see this site:
How to Test Thermocouple with Multi Meter Heating and Cooling

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Make sure the thermocouple is clearly in the heart of the flame. Make sure the thermocouple is securely and properly connected to the gas valve. Obviously make sure it is the correct thermocouple. Gas valves do go bad, so it could be that but that is fairly rare. Good luck.

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I have a Dayton 3E290 wall heater that was installed new 30 years ago. The pilot light started to extinguish a few years ago. Gradually this began to occur more frequently. I've changed the...


The pilot assembly may need cleaned out and the orifice cleaned, also the gas valve may need to be replaced, to check for proper voltage from the thermocouple you need a flame source and it takes a meter that can register DC milliamps, and should be 350 to 750 millivolts. Heat the thermocouple with the pilot or other flame source and check, if OK, gas valve is weak.

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Hold the pilot button down for a full minute after it lights, then release. If this does not work then the thermocouple is not adjusted where the flame is heating it or you just have a faulty new thermocouple.

Sep 06, 2011 | Heating & Cooling

1 Answer

Pilot won't stay lit


If a standing pilot won't stay lit, the usual cause is a bad thermocouple. The thermocouple is a safety device with a probe that is kept heated by the pilot flame and produces an electric signal. Wires from the thermocouple connect to the main gas valve. If the thermocouple fails, the main valve shuts off gas to both the pilot and main burner. When you try to re-light the pilot, it goes out again as soon as you release the pilot button on the valve.

A new thermocouple is only $10 or so, and it's pretty easy to change. There are a number of how-to sites and videos showing how to change the thermocouple in gas furnaces and water heaters, and the process is similar in commercial ovens and fryers. Once you see what the thermocouple looks like and how it's installed in some other appliances, you'll be able to identify it in your fryer and see how to change it. That should get your frying again.

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It sounds like a thermocouple has gone bad. this is a very common problem with gas powered things ie; water heaters, furnaces, hot tubs. The telltale sign is when you release the pilot light button it won't stay lit. This is a safety feature and is relatively inexpensive and easy to repair.

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1 Answer

Pilot lite will not stay lite


You need to change the thermocouple on the unit.

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First check to see if the flame is hitting the thermocouple when the flame is on when you hold down the button. If it is then remove the the thermocouple and replace with the same size. You should be able to pick one up at your local hardware store.

If when you replace the thermocouple the flame does not stay lit still you may have a bad gas valve.
Hope this helps and please rate this!

Dec 08, 2008 | Honeywell Electronic Programmable...

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