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My pilot light has gone out on my gas furnace, I lit it again, but its not staying lit. Seems like the switch makes it go out.

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Probably not the switch, MUCH more common is the sensing tube. This is the copper tube that goes into the gas control valve, and the other end is TOUCHED by the pilot light flame.

(The flame heats this tube and then this allows the pilot to remain on. The thinking is if the pilot were to go out, it is important to stop the flow of gas....)

These sensing tubes are readily available, but different across brands, so be sure to get the correct one for your unit. Easy swap out, do not kink the tubing and put the sensing end in the same position as the old one, relative to the pilot flame....

The start proceedure requires that you override the tube, light the pilot light, and continue to hold the override for xxx amount of seconds. How long differs, I observe the flame and then slowly let off the override, ready to re press if the flame were to lessen or go out.....

Posted on Mar 11, 2011

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