My GMT 080-4 looses its flame when asking for more than a 1 degree increase in temp. You have to shut off and turn on the furnace to get it to restart. The circuit board is flashing once. I've replaced the t-stat and the flame sensor to no avail.

Asked by Jim on 11/30/2008 0  Answer

ManualsOnline posted an answer 15 years, 10 months ago

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