I just got my furnace out of the repair shop. Mine would not light at all.
Blower came on but did not light. The
valve where the gas comes in had carbon build up and they simply cleaned it
and the furnace works fine. Cost me 1/2 hour labor. Its a bear to get out. I
have a 25' 1988 and I had to take the stove and oven out. Make sure you mark
your wires to get them back to the correct wire. Jauman, Akron, Ohio