*With the stat in "heat" mode & fan in "auto", furnace cycles normally until the burner lights, burns for 30 sec... No blower & shuts down. Recycles, ignitor glows but no ignition. Cleaned flame sensor, no difference.
*With stat in "heat" & fan in "on" position, everything works fine, heater runs, shuts off at set temp. (Manually turn off fan.) The flame sensor must be working with this method if burner stays lit, right?
What function is bypassed with fan in "on" that is not working with fan in "auto"?
Last edited by paul52446m; 10-30-2010 at 09:27 PM.
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