Keeprite NG furnace code "fail to ignite"

If the igniter is glowing, it is likely working.

There is a flame sensor that is usually on the opposite side from the igniter. it is just a little metal rod with a wire attached to it. Pull it out and clean it with a piece or sandpaper or steel wool. That fixes it a lot of the time.

How the electronic furnace work is pretty simple, but not very obvious.

1. The exhaust flue fan turns on ( not the blower motor).
2. A vacuum sensor in the flue detects the vacuum from the exhaust fan and closes.
3. The igniter turns on and glows.
4. The gas turns on and the furnace lights.
5. The control board starts looking for the flame sensor signal. If it doesn’t detect a flame, it turns off the gas after several seconds.
6. If the furnace didn’t stay running it will repeat the sequence every few minutes a few times. If it does it enough times you will need to cycle power to the furnace.

Once you understand how it works, it isn’t too hard to troubleshoot.

Don’t touch the igniter, they break really easy.