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    ardad's Avatar
    ardad Posts: 3, Reputation: 1
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    #1

    Dec 2, 2008, 06:41 AM
    Is my cuircut board bad?
    I have a day and night high efficiency furnas. The forced induction fan comes on then quits. Sometimes it will stay on long enough for the ignitor to light then everything quits. I used a volt meter on the pressure switches I have two. One of them doesn't receive the 24 volts. I have turn the power off the furnace overnight and when I turn it on everything works normal one time but the next time it is just like before. Could it be the cuircut board? Thanks
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 2, 2008, 06:47 AM
    Quote Originally Posted by ardad View Post
    I have a day and night high efficiency furnas. The forced induction fan comes on then quits. Sometimes it will stay on long enough for the ignitor to light then everything quits. I used a volt meter on the pressure switches I have two. One of them doesnt recieve the 24 volts. I have turn the power off of the furnace overnight and when I turn it on everything works normal one time but the next time it is just like before. Could it be the cuircut board? Thanks

    Try this first. Clean the flame sensor. Do not mess with the ignitor.
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    ardad's Avatar
    ardad Posts: 3, Reputation: 1
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    #3

    Dec 2, 2008, 07:14 AM
    Quote Originally Posted by hvac1000 View Post
    Try this first. Clean the flame sensor. Do not mess with the ignitor.
    I did that, most of the time I never get to where I have a flame.
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    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Dec 2, 2008, 07:37 AM
    Then you will have to start testing components. You say the inducer fan will start then stop. Why? Did you check if the circuit board stopped producing voltage for the fan or is the fan motor itself defective? You need to test to be sure what is the problem before you start replacing parts.
    ardad's Avatar
    ardad Posts: 3, Reputation: 1
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    #5

    Dec 2, 2008, 08:22 AM
    Quote Originally Posted by hvac1000 View Post
    Then you will have to start testing components. You say the inducer fan will start then stop. Why? Did you check if the circuit board stopped producing voltage for the fan or is the fan motor itself defective? You need to test to be sure what is the problem before you start replacing parts.
    The ciruit board stopped producing voltage to the inducer fan.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Dec 2, 2008, 09:16 AM
    Then I guess the board is bad.
    dac122's Avatar
    dac122 Posts: 463, Reputation: 17
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    #7

    Dec 2, 2008, 11:37 AM
    Quote Originally Posted by ardad View Post
    The ciruit board stopped producing voltage to the inducer fan.
    That's pretty definitive to be your board. Just to be sure, check the input voltage to the board that's passed through to the inducer fan.
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