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Old 01-23-2020, 05:05 PM   #1
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2002 Classic furnace fan stays on?

Ok, furnace is acting up. Just changed the tstat and it worked fine for a while. Now, the fan will not turn off when I set the tstat to off. Even bypassed the tstat and separated the two control wires so the circuit was broken. Still, fan stays on. Hmmmm... thoughts?
I did notice a red light when I removed the cover but it no longer blinks. And I reset the heater via the switch a few times. Click image for larger version

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Old 01-23-2020, 06:44 PM   #2
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My Atwood service manual says it is the relay. Assuming your furnace is original, the relay is a separate component and is replaceable. On the newer furnaces the relay is on the circuit board. The relay is supposed to turn power on to the fan when the thermostat closes and delay turning the fan off for a while to cool the heat exchanger when the thermostat opens. The relay is a block with 4 terminals on top. One of the thermostat wires should connect to it.

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Old 01-24-2020, 08:17 AM   #3
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Al is correct the fan control relay is stuck on. You can often get it working again for a while if you remove it, rap on it with a screwdriver handle or similar (big enough to knock it hard, but not enough to crack or break it) . If that works you can replace it when you can find one or have it delivered. The bang on it trick works when the contacts get welded together (happens when it ages and the contacts meet at a corner or point rather than across the flat surface) and usually can work for maybe 10-100 cycles. If it is a spring or a lever arm or mount that is broken then it will likely not temporarily fix the issue.
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Old 01-24-2020, 05:58 PM   #4
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Thanks. Looks like it was the sail switch. Just took it out, oiled it and the daggum think works. Just order a new one. There are three gates. Tstat , sail switch and limit switch. All pass the 12 volt along. Thanks everyone!!!
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Old 01-25-2020, 01:21 PM   #5
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Just an FYI I discovered: When our furnace decides to get finicky, and that red light is on and blinking, if I turn the thermostat completely off, then on again, it resets and the red light goes off .. and the reset switch will be functional.
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