Uncles furnace won’t stay lit. Exhaust fan comes on, igniter glows. Sometimes it won’t light at all. Most times it lights the top burner and kicks off before the second is fully lit. New flame sensor didn’t make a difference. Control board light doesn’t flash, not sure if led works though. If you let it cycle enough, it will run on occasion. Any HVAC guys have a guess? Ac lost Freon and they have used window units for a few years. They said last year it would cycle a few times before staying lit.
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