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Fan Control Board Issues

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Pete825
Pete825 Member Posts: 1
in THE MAIN WALL
I've got a RUUD furnace that is giving me fits. The fan control board seems to be working properly but I think I've checked everything else. First of all, the transformer was bad. After replacing it the IDM and blower ran constantly. Troubleshot the thermostat, then the limit switches. I had voltage going out and coming back to the board. Both green LED's lit and steady(not flashing). Am I missing something?

Comments

  • furnacefigher15
    furnacefigher15 Member Posts: 514
    Where and what

    Terminals are you testing?





    Is the only trouble continuous fan?
  • Tim McElwain
    Tim McElwain Member Posts: 4,657
    Fan and IDM will run continously

    if a limit switch is open (hi-limit, Auxilliary limit, blocked vent switch, flame roll out switches etc) or a wire off somewhere.
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