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-   -   Bad circuit board (https://www.askmehelpdesk.com/showthread.php?t=405167)

  • Oct 12, 2009, 09:38 AM
    trely
    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?
  • Oct 12, 2009, 10:07 AM
    hvac1000
    Is there a fuse on the board? If so check it.
  • Oct 12, 2009, 10:10 AM
    trely

    No fuse on board
  • Oct 12, 2009, 10:13 AM
    hvac1000
    Try jumping R and W on the board. This will eliminate the thermostat or any thermostat wiring problems.
  • Oct 12, 2009, 10:17 AM
    trely

    I did that already got 24v nothing came on. Checked all the safety switches.
  • Oct 12, 2009, 11:39 AM
    hvac1000
    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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