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    trely's Avatar
    trely Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Oct 12, 2009, 09:38 AM
    Bad circuit board
    My light doesn't not come on the circuit board 50a50-241 I have 120volts coming into the board but furnace won't do anything at all. Transformer has power on both sides. I have 24 volts when I check R and W on the board. I think it is a bad board would you agree?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 12, 2009, 10:07 AM
    Is there a fuse on the board? If so check it.
    trely's Avatar
    trely Posts: 3, Reputation: 1
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    #3

    Oct 12, 2009, 10:10 AM

    No fuse on board
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Oct 12, 2009, 10:13 AM
    Try jumping R and W on the board. This will eliminate the thermostat or any thermostat wiring problems.
    trely's Avatar
    trely Posts: 3, Reputation: 1
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    #5

    Oct 12, 2009, 10:17 AM

    I did that already got 24v nothing came on. Checked all the safety switches.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Oct 12, 2009, 11:39 AM
    If you jumped R and W and nothing came on with everything else normal then I would say it would have to be the board. This should be the WR replacement

    http://www.white-rodgers.com/wrdhom/.../0037-6265.pdf

    Also cut sheet

    http://www.white-rodgers.com/wrdhom/...A55_843_ss.pdf
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