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Question DetailsAsked on 12/10/2016

I have electroic pilot. When thermosta is switched on the flame lights then shrinks. Burners will not light

I have a 75,000 BTU furnace just serviced. It has an electronic pilot light which comes on when thermostat is switched on. The flame quickly dims and the burners do not light. I can light the burners with a long lighter so gas is getting to burn tubes/chamber.

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2 Answers


When you say electronic pilot light, I presume you mean a piezoelectrically lit pilot light (so not a standing pilot flame).

Did it work before servicing ? Mioght be he installed a new thermocouple or thermopile, which is a safety device that prevents gas flow if the pilot is not burning. If the pilot assembly (which commonly if taken out to change the thermocouple) was put back in at the wrong angle or with the draft deflector in the wrong position, the pilot flame might be too far away from the burner to ignite it right off the bat - which is dangerous because the gas can build up in the combustion chamber and then ignite with a WHOOSH, damaging the tank or blowing out the access cover. See the owners manual (download from manufacturer website if you can't find yours - newer furnaces also sometimes have thermocouple/pilot positioning instructions with the pilot lighting instructions on a stick-on label on the outside of the furnace or sometimes on the inside of the access panel.

Since gas is flowing, thermocouple and gas control valve and burners are evidently OK.

Definitely get this fixed before using the furnace - because a goodly amount of gas buildup in the furnace before igniting can cause a fair amount of damage, not to mention possibly starting a fire if it blows out of the furnace firebox. If it was working OK before the servicing, just serviced as preventative maintenance not for a failure, I would callthe tech back to fix it right at no additional expense to you.

Answered 3 years ago by LCD



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Answered 3 years ago by Member Services

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