Question about Ruud UAMB Air Conditioner

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Could the low voltage at the unit be a bad

Condenser buzzing, but fan won't turn on.
Could the low voltage at the unit be a bad fuse(s)? we will change the fuses and if that doesn't work I will post again.

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  • clbranco Jun 27, 2009

    Wow. we did have a huge lightning storm last nite. It turned out the circuit breaker. it was tripped just a little. when i turned it on the fan started right up. the buzzing was confusing me because I thought if the circuit breaker was off there would be no power for any buzzing at all. thanks for your help

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I am presuming you are talking about low voltage at the motor. The fan and condenser use capacitor assist to start them. They can be damaged by a really bad lightning storm or they can just go bad. Difficult to determine why. If you are seeing a low voltage at the motor the capacitor has most probably failed. Check for a device that looks like a thin tin can with wires on top. Get the numbers off the side and you can find a replacement.

REMOVE ALL POWER before playing with the capacitors, they store energy and can kill!!

There may be 2 caps, one for the condenser, and one for the fan. If the condenser runs for a couple of minutes and then shuts down it is probably just the fan. Easy way to check is if the coils get really hot. If it short cycles there could be a different problem. But I would venture to say it is probably the cap for the fan.

If this helped please rate my solution.

Posted on Jun 27, 2009

  • jdaniher
    jdaniher Jun 27, 2009

    I am presuming you are talking about low voltage at the motor. The fan and condenser use capacitor assist to start them. They can be damaged by a really bad lightning storm or they can just go bad. Difficult to determine why. If you are seeing a low voltage at the motor the capacitor has most probably failed. Check for a device that looks like a thin tin can with wires on top. Get the numbers off the side and you can find a replacement.



    REMOVE ALL POWER before playing with the capacitors, they store energy and can kill!!



    There may be 2 caps, one for the condenser, and one for the fan. If the condenser runs for a couple of minutes and then shuts down it is probably just the fan. Easy way to check is if the coils get really hot. If it short cycles there could be a different problem. But I would venture to say it is probably the cap for the fan.



    If this helped please rate my solution.

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24%20v%20transformer.jpgpicture of a typical transformer.

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