Suburban furnace problem solved

Went camping this past weekend in temps that dropped down to low 30's. Furnace didn't work so I pulled the grate off and all I could service was the igniter. It is a suburban nt-20seq with no outside access.. I did not have a 1/4" nutdriver to remove the igniter but since the blower worked, that was my first assumption. fix was more blankets till I got it home. After much research, I was sure it was the sail switch which I have no access to without removing the whole unit. As a last ditch effort I removed the igniter and sanded the two electrodes as oldbiscuit suggested when I had water heater issues. Put the igniter back in and poof, hot air. I lucked out on that one!