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Pilot light will not stay lit

Pilot light went out and now I can not get it to stay lit.  Solid blue flame when holding down the pilot light button but when it is released flame goes out. Start up instructions say to hold for a minute. Held it down for over two and still no luck. Do not know which part to replace.  

already replaced thermacouple, pilot still won't stay lit

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Re: pilot light will not stay lit

The flame must satisfy the thermocouple. Then the thermocouple must satisfy the valve. If you have a great flame on the thermocouple, it is possible that you have a bad gas valve, if no other saftey switches has you shut down to not allow the valve to open.

Posted on Nov 20, 2007

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Re: pilot light will not stay lit

Is it full of dust my hot water used to do the same till i blew the dust and fluff out

Posted on Nov 19, 2007

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Can't light a vulcan heritage gas heater, the pilot light lights, but as soon as I try to lift my finger off the button to ignite the heater, the pilot flame always goes off.

Hi and welcome to FixYa, I am Kelly.

What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.

  • First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
  • Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.

You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.

Thanks for choosing FixYa,

Feb 20, 2011 | Air Conditioners

1 Answer

Pilot light will not stay lit; replaced the thermocouple, still no work. Replaced the W/R gas valve 36C04-222 on my Trane furnace. Still not working. any ideas? Could I have gotten a bad replacement valve?...

Trane unit ,same White -Rogers gas valve. I have replaced both the gas valve and the thermocouple . Have agreat robust blue pilot while the button is pushed in , let go and the flame does not stay lit . I checked the milly D C volts and have better than 20 . Is there a problem with the new gas valve or the couple not generating enough volts or is there a safty I do not know about that could be open ?

Dec 15, 2010 | Air Conditioners

1 Answer

I have a Procom MN300TPA and I used it all last winter with no problem although it was very noisy. This winter I used it twice and had to turn off the gas and now the pilot wont light. I hold the button...

Hi, make sure the fitting at the gas valve for the thermocouple is tight, and the other end is in the flame good. Also, make sure you have a nice blue flame surrounding the tip of the new thermocouple.You have a small screw on the valve that says pilot you can turn up or down if needed.Use a small blade driver to raise the flame. It should hold when you turn it to on. If this continues, replace the valve. Strange it would go bad by just turning the the gas off, but that's all it could be. Just make sure you have a good pilot flame, and all is in position right, and it should work fine. Get back to me on this if you continue to have a problem, and we can go from there.
A/C, & Heating Contractor

Nov 27, 2010 | Air Conditioners

1 Answer

My 30,000 btu Blue Flame gas wall heater wont stay lit, pilot light stays lit but the blue flame went out and had smell of gas I shut off the gas supply but, dont know what is the problem thanks, marty

you could have a overdraft problem causing your flame to go out. check your draft setting at the burner and make sure it's not open too wide. If it is, simply close it it slowly and make sure that the flame remains totally blue.

Nov 27, 2010 | Air Conditioners

1 Answer

We have an older (22 years?) 'Insta-Flame (model HE30 TN) natural gas fireplace insert. The pilot light is out, as we painted to inside of the firebox. The instructions show to 1) turn the dial to 'off'',...

On some gas valves the pilot setting is on the same dial as pilot on and on .on others the pilot light has aseperate button on right side of control dial. If yours has this there will be a cut out on cotrol dial that must be aligned with button to allow it to be depressed to light pilot. If yours has this align control dial cutout with pilot button,depress button and light pilot,hold for about one min. and slowly release,if pilot light stays lit,turn down thermostat and rotate control dial normally to right . There should be arrows or marks on dial and gas valve to line up. If pilot light stays lit turn dial to next position and check to see that pilot is still lit. This should be on position, turn up thermostat and burner should light. If your dial has pilot light setting on it then rotate dial to each position,try to depress dial and when you have right one dial will depress allowing you to light pilot. Follow same procedure as above and you should be in business. Hope this helps.Thank you

Nov 11, 2010 | Air Conditioners

1 Answer

Why would the pilot light ignite then turn off?

If it is a true "pilot" light, it needs to be held down long enough to generate the milivolts needed to prove to the gas valve that he is ready to open, other wise the gas valve would open, not igniting, thus causing a "gas leak". Turn the t-stat OFF, turn gas valve to pilot, push down on pilot knob, light pilot and hold for 2 minutes. After 2 mins let go, and if pilot stays lit, turn gas valve to ON, and turn the stat to heat and turn it up to desired temp. If pilot does not stay lit after doing above, try sanding thermo couple( the thing the flame is sitting in) or just spend the $15 bucks and replace therm couple.

Nov 06, 2010 | Ruud UAPA024 Air Conditioner

1 Answer

Cannot get pilot light to remain lit. have blown out heater with can dust. it will light, but then go out when you let go of button.

Hold down the pilot light button for about a minute and a half to generate the milivolts needed to prove a flame, or try sanding down the flame sensor, it could be dirty

Nov 06, 2010 | Rinnai Air Conditioners

1 Answer

Can't find instructions on lennox gf 8 series furnace

Does it have a standing pilot light? On new units, there is an igniter and not a pilot. But if you have a standing pilot, you will move the gas valve to "pilot" and push down the red button while holding a flame under the pilot located by one of the jets. Once it lights continue to hold the button down for a minute or so and then release the button. The pilot should stay lit. Then turn the dial to the on position. That's it.......... If the pilot won't stay lit then the thermocouple is bad and needs to be replaced.

Apr 05, 2009 | Air Conditioners

1 Answer

My hot water heater will not stay lit. What could be the problem and would I be able to fix it?

The thermal couple that senses the heat from the pilot and holds the gas valve in the ready condition must be bad. It is not difficult to replace. Note: When you first lite the pilot flame you must hold the button down for at least 30 seconds before releasing it. Also check the size of the pilot flame that contacts the thermocouple.

Jun 28, 2008 | Air Conditioners

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