Bryant Furnace Blower Doesn't Stop


Old 01-02-05, 01:53 PM
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Bryant Furnace Blower Doesn't Stop

I have a recent Model 80 Brynat NG furnace. Recently, the blower fan has been staying on continously, well after the box has cooled, UNTIL the thermostat calls for heat, at which point the fan shuts off, the exhaust fan begins, the burners ignite, and then the blower starts again. Because it does stop at this time, I don't suspect a stuck fan relay.

The furnace is not cycling too often; there is a long lag between burner on condition. Any ideas why the fan is not shutting off until the t-stat calls for heat again? I should mention that the fan switch in the t-stat is set at auto, not on; and the same in the furnace - the summer fan switch is set to off.

Thanks for any help any one can give me!
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Old 01-03-05, 07:47 PM
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Location: Rochester, Minnesota
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Take a look at your install book or on the back side of the blower over, you may need to play with the dip switch with blower "Off" time.. The board may be bad and needs to be replaced..

But change the time to see if that stops it..

Some system has set up for 90 sec.. Means the blower shuts of 90 sec after the burners turns off... Don't go no less than 60 sec.
Old 01-04-05, 07:46 AM
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Thanks very much, I'll try that.

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