I have a 80MGF3 the circuit board was change out during the summer with a 19w94 ign conversion kit. The air worked find for the summer,but when the thermostat was place for heat the ignitor would not produce a spark. The inducer fan comes on, the gas valvue opens, the ignitor tries to ignite, but there is no spark. The instructions that came with the new board seems to have been misplaced, but every thing seems to be in order.

I have the same problem. Did you solve the problem? You may already have this manual but if not... http://hvacpartsshop.net/80MGF_Series.pdf

Thank you No WShere Man I did not have the manual. I down loaded the manual and discovered that every thing was correct. However, I found a defect in the new board. Problem solved.