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Furnace doesn't heat the burners come on for about 3 seconds then shut off. The furnace is a Trane XL80

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The flame sensor is not sensing that the flame has come on....the flame sensor could be dirty or the could be ignition module problems...

I am assuming that this is not a new installation....because reveres polarity can cause that also....

I would clean/ replace the flame sensor first and then from the the control board will ned to be replaced if that don't work.....

Have had to drive a totally separate ground rod and ground the furnace separately in one extreme case...


Posted on Nov 15, 2010


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