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Pilot light won't stay lit when you try to turn control knob to thermastat. Is it the thermocoupler, the control valve or the pilot assembly?

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Once your pilot is lit the thermocouple sends millivolts to the gas valve to tell it that the pilot is lit and to allow the gas valve to open. Check to see if your thermocouple is in the pilot flame. I f it is then you will need to replace the thermocouple.

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Posted on Oct 03, 2009

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Village series QV32B pilot light won't stay lit


Classic symptom of a malfunctioning thermocouple. When you press the knob, you force the gas valve open so gas will flow. The function of the thermocouple is to confirm that the pilot is lit and allow gas to continue to flow when you release the valve. A new thermocouple is not that expensive. Good luck!

Jan 05, 2015 | Heating & Cooling

1 Answer

Heater pilot light will not stay lit after knob is released


99% of the time it is just dirt and dust in the pilot light. NOT a bad thermocouple! These units generate their own power through the pilot light and it has to burn perfectly. Turn off gas supply, remove the cover and the pilot light assembly, including disconnecting the tiny gas line from the gas valve. Blow compressed air in, around and through it to get dust out. Replace everything, use soap bubbles at gas fittings to leak test and light the pilot. I bet it stays lit.

Feb 08, 2014 | Dyna Glo Heating & Cooling

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

Pilot won't stay lit, replaced thermalcouple but


I would remove pilot light assembly and clean orifice and blow out gas line to pilot. Check to see that thermocouple is centered in pilot flame. It is possiblethat your gas valve is bad but it is also possible that you got a defective thermocouple. I would change the thermocouple again as they are much less expensive then the gas valves. The next time when you are sure you have the thernocouple mounted as close to the center of the pilot flame hold the pilot button down for several mins. If none of this works then you may have to change your gas valve.Thank you.

May 06, 2011 | Rheem Water Heaters

1 Answer

I have a spark and gas coming through on my heater but it will not stay lit...I can light it with a lighter but again it will not stay lit...please help


The pilot assembly may be dirty (dust, lint, pet hair) or the Thermocouple has failed. The thermocouple is a safety feature that stops gas from coning out of the pilot, if the pilot suddenly goes out.

If you can disassemble the heater cabinet, you can access all of the inner workings. To clean the pilot assembly use canned compressed air with a straw nozzle (like you clean your computer with). Blow out the pilot tip and all down the pilot assembly. If you see a lot of dust inside the heater cabinet vacuum it out with a vacuum that has a hose and brush attachment. A crevice tool works well too.

After doing all of the above, reassemble the heater cabinet, and try lighting the pilot. Be sure the control knob is right in the pilot position, when you depress it to light the pilot. If it doesn't go all the way in and your don't feel strong pressure pushing back on it, it's not right in the pilot position. Turn it a hair one way and then the other, until you locate it exactly. Light the pilot as you normally would, hold the control knob in for one minute after it lights, then ease off of it slowly. In the Pilot stays lit, let it burn for a minute before turning it to the ON position. After that, you should be back in business.

If the pilot lights and fails to hold, the Thermocouple will need to be replaced.

Feb 18, 2011 | DeLonghi Heating & Cooling

1 Answer

How do i light pilot light?


Remove front cover,or just lower section if you can. they usually just need to be lifted up about an inch or so and pulled out. However some have covers that snap in place. After you remove cover locate gas valve. It should have a control knob on top with markings for on, off, and pilot. Set control to pilot. Follow lines from gas valve to burner compartment, one goes to main burner one ,small copper colored line is the thermocouple, other line is the pilot. Turn thermostat down as far as it will go. Make sure gas supply valve in line to heater is on and then depress pilot control , when you have pilot control depressed have a match or other small flame source close to pilot assembly. If it lights then hold down on pilot control for a couple of mins. Slowly release pilot control and if it stays lit turn gas control to on. Turn thermostat up to call for heat and burner should light. If pilot doesn't stay lit when you release pilot control then try again holding pilot down longer. If it still won't stay lit then thermocouple will need replace. Good luck. Thanks

Nov 22, 2010 | Williams 6508732 Gas Heater

1 Answer

Im calling for heat from the thermastat and control panel, the boiler light and and the fan is running, but no matter how many times i keep re trying the pilot and burner will not commence, is there...


I would check to make sure control on gas valve is in on position and pilot is lit if you have a standing pilot. If you have a spark or hot surface ignitor make sure they are trying to lit pilot. If you have standing pilot model and pilot lit is not on. Turn control on gas valve to off,wait five mins. then turn to pilot. Depress botton and try to light pilot. If it lights hold down for a couple of mins. then release.. If pilot stays lit turn control to on. If thermostat is calling for heat this should bring main burner on. If pilot does not stay lit then replace thermocouple. Hope this helps. Thanks

Nov 16, 2010 | Heating & Cooling

1 Answer

How do I light the pilot on my InterTherm MGBB 070 furnace? I have tried holding in the pilot switch but have had no success in getting the pilot lit.


Just to make sure you are trying to light the pilot, from the gas valve follow the small diameter pipe (1/8") to the pilot assembly. Where you should be placing your flame is above that point. Now with the gas valve knob turned to the Pilot marking, depress the know into the gas valve. Light the pilot. Check to see if it is lit and remain holding the knob in for 30 to 45 seconds. If the flame goes out as soon as you let out the knob, you will need to replace the thermocouple.

Oct 11, 2009 | Heating & Cooling

1 Answer

Need to light the pilot light


I am not familiar with this particular brand. What type of heater is it? Normal pilot lighting is done by setting the gas valve to the "Pilot" position and then pushing on the valve to manually open the pilot. After this, light the pilot and continue holding the valve for 30sec to give the thermocouple a chance to heat up. Release the valve and it should stay lit. Turn the gas valve to "On" and you're done. If it doesn't stay lit after releasing the valve, replace the thermocouple. If it doesn't light at all, call a technician out to check gas pressure, orifice, and pilot assembly.

Oct 03, 2009 | Napoleon Heating & Cooling

1 Answer

Patio Heater pilot lights won't stay lit


crappy pilot flame (not properly heating the thermocouple), bad thermocouple, thermocouple loose where it screws into the pilot safety valve, bad safety valve magnet.

One or more of those is the problem.

Oh...there is also a saftey switch...in case it tips over. It will also cause the pilot to not stay lit (if the switch or wires that go to i are faulty)

May 30, 2008 | Coleman (5040B750) Patio Heater

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