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Old 03-25-2011, 07:59 AM   #1
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combustion fan


I have a furnace about 15 years old. the combustion fan from time to time will keep cycling on and off and could go on for hours. If I raise the temp. on the thermostat the burner light up and I have heat. Problem goes away for awhile then it starts again. What would cause this to happen

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Old 03-25-2011, 08:04 AM   #2
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Hi and Welcome ReneLM, to the best DIY'r site on the web.

Sure sounds to me like your thermostat is not set with enough hysteresis.

Mark

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Old 03-25-2011, 08:07 AM   #3
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short in the board ? Disconnect the t.stat wires & leave them off for a while & see if the motor turns on
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Old 03-25-2011, 05:21 PM   #4
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Did you replace your thermostat recently. The cheap power stealing types can cause your problem. I would replace the thermostat with a good quality Honeywell Focus Pro from HDepot.
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Old 03-26-2011, 02:54 AM   #5
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Jackofall1

For the benefit of this dinosaur, is thermostatic hysteresis the electronic equivilent of anticipator settings?
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Old 03-26-2011, 04:54 PM   #6
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Jackofall1

For the benefit of this dinosaur, is thermostatic hysteresis the electronic equivilent of anticipator settings?
Yes, exactly, the differential between the off and on, or the overlap.

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