Do you know if voltage is going to the burner assembly? If the igniter isn't glowing at all, I would suspect, your high limit thermostat (AP3084674) or the thermal fuse (AP3132867) behind the rear panel has failed. Try bypassing each one at a time by sliding the ends of the connectors together and see if the unit starts to heat. This is a temporary method to test and should not be used as a permanent fix.