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Discussion Starter · #1 ·
I have a Heil model #H9MPV075F12C1. The draft motor turns on, ramps up and then shuts off. It does this with no call for heat, no LV wires connected. It does this on and off, no rhyme or reason. I already changed circuit board, which Heil said was the problem, but still continues.
 

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Dr Heat
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Sounds like a limit switch failing.
 
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