Take the cover off, if its anewer one it is probably a glow coil ignitor.
Plug unit in, if it does not glow then either the control board where the
ignitor terminals plug in are bad or the ignitor is bad.
You can either apply 120volts directly through the ignitor leads if you
are electrically inclined and see if it lites up. If it does then part of the
board is bad. However you can tie into line 1 and nuetral and not use
ignitor terminals on the circuit board.
If you need a replacement ignitor you will have a hard time finding one,however I used a White Rodgers 21D64-2 Universal Ignitor Kit
that I got from Johnstone Heating and Cooling Supply Company.
My heater was only 3-5yrs old.
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