Question about Ruud UAMB Air Conditioner

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Condenser is buzzing so there is power, but the

Ruud condenser is buzzing, so there is power, but the fan won't kick on

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  • clbranco Jun 27, 2009

    thank you rockitman187. it turned out the circuit was a tripped, prob. from the lightning storm last nite. all is well now. thanks for having me check the power

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The buzzing sound is from the contactor and only means you have low voltage at the unit,Check and make sure you have 240 volts at the unit and post back.

Posted on Jun 27, 2009

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1 Answer

Fan wont kick on


a bad fan motor they will go bad is the blower on your inside unit or the condenser assembly outside either could be a bad motor

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Have a Ruud Achiever Model number UAKA-037JAZ that won't run since yesterday. When the air kicks on it simply makes a buzzing noise and the fan doesn't spin. Can anyone help?


try spinning by hand when the unit make the buzzing sound. to see if the capacitor is bad. If the fan runs replace the cap. If not motor probably is bad. See if it spins freely. this is a good starting place. need to check if the buzzing is the contactor and there is no power to the condensor. The contactor will buzz even though the main breaker is off or tripped

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Jun 07, 2008 | Ruud UAKA030 Air Conditioner

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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!

Jun 07, 2008 | Ruud UBHC Air Conditioner

1 Answer

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Does the fan on the outdoor condensing unit come on when the compressor does? If so, Is the condenser coil clean so that the airflow from the fan can remove heat from the condenser coil so the compressor won't overheat and trip the internal overload compressor protection circuit? If yes then is the indoor evaporator fan working properly? If yes are your filters clear and evaporator coil clear so that adequate air is flowing over the coil to prevent the compressor low pressure protection circuit from tripping? If so is the refrigerant charge on the system correct- either overcharged or undercharged can trip the compressor protection circuit. By now you should have come across an explanation for your compressor short cycling. If I had to guess I would bet on inadequate airflow over the condenser coil do to a faulty condenser fan motor either not turning at all or turning for a few minutes and then stopping when it overheats. This is likely caused by an unsealed replacment motor being used outdoors and water/rust has accumulated over the winter season and/or the capacitor is bad (in this case the motor may be turning slowly backwards) or just plain old worn out. I hope this helps get you to cold air sometime soon GL!

Jun 06, 2008 | Ruud UBHC Air Conditioner

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It sounds like your condenser fan motor may be locked up or the capacitor that helps give the condenser fan motor a kick to get it started may be defective. Try turning your system on and using a long screwdriver try to push the fan blade on the condenser fan motor to see if it will run normally if you give it the starting boost it needs.If it does run at full speed and doesn't over heat or start and then slow down then you probably only need to replace a simple 10-12$ capacitor. If it barely turns, makes an odd humming sound or overheats etc. then you will have to replace the condenser fan motor. This is assuming that the outdoor condenser has the 220v supplied and the 24v supplied to the compressor relay, that the compressor relay is engaged and suppling 220v to the condenser fan motor.

May 28, 2008 | Ruud Matching Split Air Conditioner

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