Question about Ruud UBHC Air Conditioner

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I have a heat pump unit. the fan will not come on. on the outdoor

Heat comes on. but is not blow n inside

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  • Anonymous Feb 10, 2009

    My problem is similar, although I'm not sure that it is just the fan. I had someone come to check it and they said that the "defrost control board" was bad. They replaced it and the unit seemed to work for a short time, but now we are back to square one. If this thing burned up another control board, what should I do? Could it be something else?

  • RDrennan May 11, 2010

    We need a bit more diagnostics than simply the fan won't come on. I'm sorry. There are many things that can cause this. If the outside unit comes on but the indoor unit does not blow air than we can be assured that there is control voltage up to the thermostat and power to the indoor unit. So what we need to doo is verify if there is power, 24 volts getting fro "R" to "G" at the stat and then also at the indoor unit. If this is so then there only remains three possibilities, a bad fan control board, faulty wiring to the fan motor or a faulty fan motor. This is the diagnotics ahead of you.

    If you have any questions feel free to contact me directly...



    Richard (Rick) Drennan
    Global HVAC Distributors
    RUUD Field Support Representative / Instructor
    rdrennan@globalhvac.com
    900 Spreckels Ave
    Manteca, Ca. 95336
    Office (877)448-7263
    Cell (209)456-0513

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  • 8 Answers

Ck capacitor on blower motor,ck relay,also make sure you have signal from thermostat to indoor unit

Posted on Mar 19, 2009

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