Question about Ruud UBHC Air Conditioner

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Ruud out side unit

MY outside unit wont come on it just gives a buzzing noise what could be the problem

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  • HOVEW31 Jun 08, 2008

    THE FUSES WERE BLOWN IN THE BOX OUTSIDE YOUR TIP SENT ME STRAIGHT TO THE PROBLEM THANK S

  • lwalton Jun 09, 2008

    My unit comes on but air doesnt blow.

  • PreissDog Jun 11, 2008

    I have the same problem but I don't see where there is a fuse outside.

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It sounds like you may have lost line voltage to the unit. What you hear is most likely the buzzing of the compressor relay which is energized by 24v from the indoor unit. Look at your condenser coil, are the aluminum fins clogged with debris? If so this is likely the cause of the tripped breaker and will need to be cleaned. Before you go to the trouble have someone go to your breaker panel and flip all the 220v DPST breakers off and back on while you watch and listen to the condenser to insure that the fan and compressor will come on line as soon as this is confirmed turn the breaker off and clean you condenser coil, the correct way to clean the condenser coil is to remove the disconnect plug at the unit or turn of the line voltage at the breaker, remove the top panel that supports the fan , flip it over being carefull that it's weight is supported in a way that wont stress the wireing harness to the fan motor. Spray the inside surface of the condenser coil with a heavy foaming cleaning solvent and let it have time to saturate the grime compacted between the fins then spray from the inside out and from the top down until the water runs free and clean from the inside thru the coil. Replace the top panel and allow time to insure that any water that might have gotten into the fan motor housing has evaporated, Then start it up if that was the original cause of the thrown breaker (very often is) then your in good shape and just saved a service call, Gratz!

Posted on Jun 08, 2008

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Is the buzzing in the outdoor half of the system? If so
your possibilities are.
buzzing could be the contactor. In the control compartment on the side of the unit there is a small brown component that has wires to one side and the other . There are contacts in the center like points on a car. If the points are pulled in look for ants in between the contacts. Always secure power to the outdoor unit before touching anything inside. If the points are pulled in check your breaker to the outdoor unit. Turn the breaker off then back on. Breakers sometimes trip but look ok.
Buzzing could be thee coil to the contactor itself, sometimes with age the coil will breakdown and cause noise.
if you give me more information I can focas in closer to a solution

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