I had my furnace tuned up today and one of the things the tech noticed is the ignitor was ohming out at 253. He said this indicates it may fail soon and would've replaced at the time if he had the part in his truck. It's for a Lennox G43UF and the ignitor part is model 697 75M2101 95 V. After some googling, it looks like the ohms range on this ignitor goes up to 450. Seems like most of the other ignitors have a lower range. Is this one fine given the specs or should I have it replaced?
david8370
I would not replace it due to that reading. I also would not check the resistance of an igniter because I don't believe it provides any useful information as compared to other methods of diagnosis. Igniters resistance increases with age so if your numbers are accurate they should be just fine but I go by visual inspection and how bright and evenly it lights up when it's energized and on the larger high voltage igniters I check amp draw as an additional diagnostic piece but never resistance.
Yeah, I'm an old school service tech, not a sales tech, I only replace them when they no longer work. :grin2:
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