My goodman gmnt100 won't light just replaced the ignitor about 3 weeks ago was working fine and then started lighting intermittantly now won't go at all

On begin start up tell us what its doing. Have you bypassed the tstat ? To rule it out

Ignitor doesn't warm but if you use a different power source it gets real hot

on begin start up tell us what its doing. have you bypassed the tstat ? to rule it out

You hear it kick in and the vent fan runs but never lights

Sounds like you need to look at replacing the circuit board,, does it have a blinking led light on the board?have you checked the igniter with a meter? While starting are you getting power to the igniter from control board, should be reading 120-130 volts during time it should be lighting

I have the same issue. I get 8 flashes and after a 30 minute power cycle it **usually* lights but tonight... nothing. The ignitor was replaced a month or so again and the same issue began about 2 weeks later... help