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Thermocouple had white soot on the end

Thermocouple has white soot on the end

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Its not soot is cardon brush it off with a clean brush also pilot could need a clean

Posted on Dec 13, 2012

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Pilot has been going out on its own


You most likely have a bad thermocouple that needs to be replaced, but other causes can be a blocked flue, sooted-up burner chamber, strong down draft from wind blowing out your pilot from improper venting or high temp switch is bad or needs to be reset. Need more info on your type of heater to diagnose it. Check the pilot flame when lit and see if it is heating the thermocouple and making it red hot. It should be a nice firm blue pilot flame. Lazy yellow pilot flames may not be heating the thermocouple enough or has caused the thermocouple tip to be burnt off and is now failing to keep the pilot lit.

Mar 16, 2015 | Heating & Cooling

1 Answer

The pilot goes out when the heater cycles


The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

Feb 18, 2015 | Williams Wall Heaters: 50,000 BTU/Hr...

1 Answer

What does the thermocouple look like?


Note that sooting with yellow flame is the result of insufficient air (i.e. oxygen) mixing with the propane gas. You need to identify where do you open the orifice or neck where the propane gas is released to burner. Open this orifice wider to add more air mixture to your propane and you should be able to get the flame back to bluish color.

Best of luck.

Mar 25, 2012 | Imperial Kitchen Appliances - Others

1 Answer

Pilot light goes out when thermostat goes off


There is a Thermocouple device that needs to be kept HOT by the pilot. Is the pilot doing this?-- Is the Thermocouple dirty (maybe sooted up?)

Thermocouples do have to be replaced occasionally-- when was this one replaced last?

The Thermocouple actually generates a small electrical current-- and that is enough to keep the gas valve open, ready for the next call for heat. Make sense?

Mack B

Jan 06, 2011 | Heating & Cooling

1 Answer

My heater lights but then does not stay lit (goes out after about 30 seconds). Any suggestions??


Sounds like the thermocouple is failed or really dirty with soote. When the flame lights and the thermocouple is in touch with the flame...it will create a minute amount of electricity which is sensed by the controler of the system. If it does not sense the flame then it will time out and shut off the gas supply regulator valve and pilot tube!

Oct 07, 2010 | Berkeley Forge G-PH001PSS Open Flame Patio...

1 Answer

Pilot won't stay lit


What color is the pilot flame? Yellow/orange or blue? Look at the tip of the thermocouple where the pilot flame is heating. It should be a smooth round tip. If the tip is partially burn't off or ridgid, replace the thermocouple. After the pilot is initially lit, does the burner come on too? Take a flashlight and look up inside the water heater above the burner. Do you see a lot of soot build-up? Light a match at the top of the water heater at the draft diverter (it attaches the venting to the water heater) and blow it out and see if the smoke gets sucked into the diverter or blown out. It should get sucked in. If not you may have vent blockage or soot build-up.

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2 Answers

Pilot light does not stay lit


check that pilot flame is in contact with the thermocouple the small copper cylinder if not properly burning against adjust if flame is good and the therm/coupl is not covered in soot(wipe clean if has build up)thermocouple gone bad replace

Oct 28, 2009 | Goodman GMS90703BXA Heater

1 Answer

Pilot keeps going out


check thermocouple small copper sealed tube that flame burns against flame should be burning on tube when starting or as pilot lite,if has soot wipe with rag if adjustment good and clean replace thermocouple

Oct 27, 2009 | Procom QL300TYLA Heater

2 Answers

My pilot light will light, but will not stay lit? I have a gas whirpool water heater aprox 1 1/2 years old.Thisis the first time we have encountered any problems with our appliance.


Once the flame has struck it heats up a thermocouple that in turn holds the gas valve open

It is a safety measure in case the flame blows out and the gas keeps on coming.

Sometimes the end of the thermocouple gets dirty and a scrub with a fine emery board does the trick

If not it is a new part (They are not that expensive)

Jul 07, 2009 | Whirlpool Water Heaters

1 Answer

Propane will not flow through adjustment valve.


Your regulator has a thermocouple that senses the pilot before allowing the valve to open. It is sensitive to the miniscule amount of energy that is produced from the flame. Your thermocouple is bad or covered in soot and needs replacement/cleaning/adjustment.
Locate the thermocouple, and sometimes it can be cleaned with fine sandpaper. If it is not in the line of the pilot flame, make an adjustment. You cannot keep the pilot lit if the thermocouple does not sense the flame. It will go out when you release the button.
Clean or replace the thermocouple to fix.

Jan 16, 2009 | Blue Rhino Uniflame Patio Heater Stainless...

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