Bill, I don't disagree with you that a new furnace would be a good idea, but financially this isn't the best time for us to drop $4k or so. I can easily replace a controller, limit switch, or gas valve, and can buy through from our local wholesale HVAC suppliers thanks to a family business account.
Should a limit switch be open or closed at room temp? I'm leaning towards the upper limit switch after Brian's suggested experiment. Pics are below, excuse the crappy camera phone quality I was in a hurry this morning.
John, it's always a valid concern with a furnace. However, in this case it's the burner that does not operate long enough, not the blower. Regardless, I do have a CO detector plugged in adjacent to the furnace, so we should be notified if there's a leak.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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