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The heater cuts on but when it cuts off the pilot goes out,the thermo cupler has already been changed. It will not stay on.

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Sounds like the gas valve is bad. The pilot is controlled through it. Sounds like instead of just shutting the burners off, its turnin the pilot off too.

Posted on Oct 06, 2010

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1 Answer

I changed the thermo coupler and the pilot light does stay lit but the burners won't light


If you are referring to a gas fireplace:

  • Make sure the pilot knob is turned from "pilot" to "ON" or it will never run.
  • If the pilot knob is "ON", and the pilot is lit, but the burner won't light, it could be a bad Thermopile. The thermopile is the other safety mechanism in the pilot assembly that controls the burner.

Dec 19, 2012 | Heating & Cooling

1 Answer

The pilot won't stay lit on gas hot water tank.


Make sure thermocouple tip is seated inside the burner flame.
Make sure thermocouple is not overtightened. Finger-tight + 1/4 turn.
If the pilot lights, then ECO energy cut off is not tripped, but gas control valve might be bad.
Check color of pilot flame: it should be strong and clear blue.
If pilot flame is weak, or color of flame is yellow-orange: Clean pilot orifice and burner and combustion parts on yearly basis.
Clean air intake screen if applicable.
Increase air supply to water heater. Open a window and see what happens.
Check for adequate draft going up chimney using match under vent hood to see if smoke drafts immediately upwards.
Bleed air out of gas line.
Check gas pressure.

Open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Pilot-outage-troubleshooting.pdf
http://waterheatertimer.org/pdf/Vent-spillage-test-atmospheric-gas-water-heater.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Sep 21, 2011 | Water Heaters

1 Answer

I have a pyromaster ventless gas fireplace. the pilot will light but will not stay lit unless i'm depressing the pilot


Your thermo-couple is bad. It`s the rod the pilot light hits with a very small copper tube that goes to the gas valve. You can pick one of these up at your local hardware store for about 15 bucks and they are easy to change.

Feb 05, 2011 | Heating & Cooling

1 Answer

I have a rheem fury 50gal gas water heater that will not stay on. I have replaced the thermo couple, it did lite but then went out.


I would like to know how old this heater is. This information can be found on either model or serial numbers.It won't appear obvious but last six numbers will tell you. You have already changed thermo-couple so I would check to see that it's properly centered in pilot flame.When you light it hold pilot button down for two-three mins.while watching thermo-couple.It should be a nice cherry red. If it is and pilot goes out after you release button then you either have another bad thermo-couple or gas valve is bad.If it does not get cherry red at least on tip then you need to reposition thermo-couple and try again. If gas valve is bad and heater is less then six years old valve will be covered under warrenty,however labor won't typically be covered unless you have extened service contract.Hope this helps.Thanks.

Nov 03, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

My pilot light wont stay lit


Hi try cleaning the pilot light out make sure the thermo couple is in the flame,check where the tcouple goes in to the valve nothing stuck in there try this it could be the valve not working

Feb 07, 2010 | Heating & Cooling

1 Answer

Williams debonair wall heater + pilot light problems


THE flame from the pilot should shoot past the thermo-couple and heat this up and make a small amount of mili- amps to prove the pilot light is lit. ..So if the flame doesn,t go past the thermo-couple it won, make mili-amps or its tme to change out the thermo-couple, They only cost lest than $8:00 and you can change it!

Dec 22, 2009 | Williams 3003622 Ceramic Wall Mounted...

2 Answers

Pilot wont stay lit


Check the thermocouple,Its is a flame senser.It will not stay lit if it is bad.

Oct 04, 2009 | Water Heaters

1 Answer

Hayward H250 (millivolt) pilot won't stay lit


make sure the flame hits the thermo couple if so then replace it lows has them in the water heater section thermo couple gets hot makes millivolt signal then opens gas valve

May 08, 2009 | Hayward H Series Millivolt 250,000 Btu...

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