I've cleaned the flame sensor after days of ups and downs into my attic. I'm wondering if there is a reset switch that I need to trip. My steps were 1) unplug the power source, 2) remove covers, 3) turn off gas control switch 4) clean flame sensor with steel wool and 5) reverse through the operations 3 - 1.

Help!

On the reverse side of the door panel, you will find a sticker with the diagnostic codes on it. Research it and narrow down your search. There is no factory installed reset switch other than the door switch for this unit, however one of the limits may have a small reset switch found in between the wire prongs. You will need very sharp eyes to see it.

A code 14 is a generic code saying it exceeded # of tries. When in front of the furnace, you will need to tape the door safety switch down and watch as the furnace tries to start. The sequence of operation is as follows. Call for heat, light on board will blink, inducer fan will start, pressure switch will make contact, igniter relay will energize, igniter will glow, gas valve will open, burner will ignite, flame will spread to all burners, flame sensor will sense flame and keep gas valve open, room air blower will start after 90 seconds.

Miss one of these steps and you get what you got! No Heat.

Thank you for the reply. Turns out that it was a blown 3 AMP fuse on the circuit board.

I had same issue, fuse was fine.. had code 14, it told me to go to 34.. my problem was i was leaving heat on at thermostat.. when i turned it off and started furnace without heat.. the led was solid red and after a few minutes turned on heat and my furnace worked fine now..