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When heater fails to start - Heating & Cooling

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  • quackman Sep 24, 2008

    The heater goes through all of the checks but fails to light and then the blower comes on and blows cool air through the house. When checking at the gas vent on the heating system, was warm and cooled down aftr a short period of thime


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If the flue is warm that would indicate that the flames lit for a short while. furnaces sometimes have limit switches that shut down the gas if the heat exchanger gets too hot. I would verify you have clean filters. and all registars open fully.
If the flames are not lighting verify gas valve is recieving the 24vlts. to open.
Also check ignition system it will be a piolet light or hot surface ignitor. you should be able to see both without much trouble. hs ignitor should get bright cherry red.

Posted on Sep 24, 2008

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Sounds like a dirty flame sense rod. Be sure to shut off power before removing the rod and cleaning it with sandpaper or steel wool. Do not touch or disturb the hot surface ignitor or you may cause it to fail.

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