I saw in your other post, that dissemble and clean did the job. From what you wrote, sounded a bit like it was wired wrong. In any case, glad you managed to get it going for now. Hope it stayed fixed.
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Christopher A. Young Learn more about Jesus
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The service guy told me that the limit switch both turns the burner off, and forces the fan to turn on, so that the heat exchanger gets some cooling if the fan switch is broken.
So the behavior is normal for a broken fan switch -- it's just that fixing the fan switch doesn't fix the @$#% behavior.