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    douglas54smith's Avatar
    douglas54smith Posts: 4, Reputation: 1
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    #1

    May 19, 2007, 08:56 PM
    Day & Night furnace blower runs every minute
    The Day and Night furnace air blower runs for 20 seconds every minute. This happens even when the thermostat is completely disconnected. The only way to stop this is to unplug unit for several hours( 3-6 ) then it will operate normally for 6-8 hours before starting the blower every minute. Any ideas?
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #2

    May 19, 2007, 09:10 PM
    What is the model of the furnace?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    May 19, 2007, 11:50 PM
    I believe you will be replacing the circuit board unless it has a separate motor timer device. If it is a newer model with a DC motor hold on to your hat when you get the price.
    douglas54smith's Avatar
    douglas54smith Posts: 4, Reputation: 1
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    #4

    May 20, 2007, 07:23 AM
    Model # is: 398AAV036040A
    Product # is: 398AAV036040AAKA

    Blower motor is 120 VAC
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #5

    May 20, 2007, 08:01 AM
    I agree with hvac1000, I'd say it's a bad blower relay on the control board.
    douglas54smith's Avatar
    douglas54smith Posts: 4, Reputation: 1
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    #6

    May 20, 2007, 09:16 AM
    Do you need to replace the control board or can you just replace the relay?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #7

    May 20, 2007, 09:37 AM
    More than likely the relay is part of the board. You will have to look on your furnace for the wiring diagram.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #8

    May 20, 2007, 09:47 AM
    What brand is the furnace? I'm not familiar with that model number.
    douglas54smith's Avatar
    douglas54smith Posts: 4, Reputation: 1
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    #9

    May 20, 2007, 10:23 AM
    Okay, I have the control board in my hands. The blower relay is part of the circuit board. Looks like I would need to use a soldering iron to remove Now can you guys tell me where I can get a new board? I would call a tech in, however, where I live (far north Sonoma coast of California) it very difficult to get services up here. By the way thanks very much for your help.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #10

    May 20, 2007, 11:39 AM
    Try here

    http://www.expertappliance.com/partfinder.php

    Bryant Furnace Parts PAGE 1

    Bryant Parts

    Bryant Parts, Bryant Furance Parts, Bryant HVAC Part, Bryant Heater Part

    Carrier, Bryant, Payne, Day & Night

    If you can get the part number you can always check Ebay.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #11

    May 20, 2007, 04:33 PM
    Check all your limit switches first. If you have a bad spade or wire connection going to a limit switch it will do what your saying. If the 24 volt circuit is broke at any time heating or cooling the blower will run. Sounds like a loose 24 volt wire connection to me.
    bsaah's Avatar
    bsaah Posts: 66, Reputation: 0
    Junior Member
    		  
    #12

    Apr 13, 2008, 03:10 PM
    This is what is wrong with your unit it is old and the old it gets the more time you use it so get a NEW UNIT That's ENVIROMENTLY Friendly
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