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I have a Lennox g50uh(x) furnace. I had a chilly night a few weeks ago and went to turn my furnace on and noticed that the induction fan would start but it would not ignite. This started a long troubleshooting process that has left me stumped.

It started when I installed a new thermostat. I noticed that I only had 4 wires coming from the furnace when then furnace had a a 5-wire connection. The common wire was missing and my new thermostat required the C line so I ran a new 5-wire line. This did not resolve the issue of the furnace not igniting but it was something that needed to be done and now that could be ruled out.

My next step was the check the igniter. I see that that igniter appears to not be getting power or malfunctioning because the igniter never heated up. I get a new igniter from a local shop. I don’t have a picture of the actual igniter since I’m at work but I’m fiarly sure THIS is the exact one I bought. So I replaced the old igniter using gloves careful not to touch the ceramic part of the igniter. I turn the power back on and get the thermostat calling for heat and then nothing. This igniter won’t heat up either.

I talk to a friend who worked in HVACC at some point and he tells me that maybe its the board that is out theorizing that maybe the old igniter was it was dying was pulling too much voltage and maybe fried the board. I don’t know if that was the case but it sounded reasonable to me. I buy a new board and install it and the igniter still won’t heat up.

At this point I decided to call a professional service tech. They came out checked everything else out (pressure regulator valve, flue, gas and gas pressure). He gets the igniter to heat up finally but the furnace STILL WON’T IGNITE.

He was unsure why, called his boss and they came up with the idea that my igniter was 80v and I needed a 120v igniter since my board was 120v. I’ve searched the internet and I cannot find any type of 120v igniter for my model furnace. Below I’ve attached my furnace manual and a diagram of my board. Any Ideas? I have no idea what to do.

https://imgur.com/a/OiQ7gq9