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There's a buzzing sound coming from my central air conditioner unit outside. The fan is quiet but I hear a buzzing sound. Should that be happening? Sounds like there's something loose.

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Things that are not broken: The big relay that powers the compressor often hums or buzzes when the unit is running. Several brands of heat pumps keep their reversing valve "on" any time the thermostat is set for "cool". They buzz, too.

If something really is loose, the only way to fix it is to look at the machine and take off panels until you find what is buzzing.

Posted on Jul 22, 2008

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There is a hissing sound on my Window AC and suddenly the cooling stops.

Posted on Jul 14, 2009

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Central air unit, outside unit fan runs, but not cooling. Compressor seems to turn on/off continously. Buzzing sound interminately.


Sounds as though the contactors are not pulling in tight. shut down the poer to the unit and check the contactor. you will find them behind a panel door on the outside unit.. BE CERTIAN that you have disconnect the power ot the unit . the contactors will have wires running to the compressor. you might not be able to see the pints on the contators. but you can remove the cover and take a look. you can ppush them in and let them move back a forth a bit . put it back toghter and turn it on. If you still hear the noise you will have to repalce the contactors . also the same applies for th outdoor fan as well. Good luck and let me know.. I really hope this helps Jon

Jul 24, 2011 | Ruud Air Conditioners

1 Answer

I need help with a buzzing sound in my air conditioner.


It is probably the compressor humming. They can make some funny noises especially on start for a while. If the unit is not cooling it may be the start capacitor or the comressor may be locked up.

Jul 19, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Goodman a/c unit outside not coming on. buzzing


Sounds like compressor is bad...taken out by a bad contactor.

Aug 17, 2009 | Air Conditioners

1 Answer

A/c outside not working


The buzzing noise is your contactor drawing in from your thermostat. The fan part of your unit is on a different circuit from your outside A\C unit. Your thermostat is the conductor of the orchestra tying ths units together. It may well be that your A\C circuit breaker has tripped, if it has there is a reason for it's tripping. Resetting the breaker by turning it off then on may get your unit running, but a technician needs to ascertain why it tripped. Or it could be a bad contact switch inside the outside unit not letting enough electricity through the switch. More than likely the first issue. Good Luck

Jul 15, 2009 | Goodman CKL36AR36 Air Conditioner

1 Answer

Air Conditioner Compressor Fan Quit


Check the start capacitor. You may be able to see visual deformaty, otherwise, use a meter. The buzzing is most likely the contactors closing which uses a seperate 24v supply..

Jun 26, 2009 | Kenmore Air Conditioners

1 Answer

Outside Unit blowing air but not cooling and slight buzzing sound


The compressor is not coming on and some part of that unit has failed. Do you hear any clicking sounds along with the buzzing sound? Recommend that you shut the unit down (remove power from it) until a service tech can listen to it try to start up.

The power company-installed load management system is probably a red hearing. That system will either fully turn off the unit or allow it to turn on/start up.

May 08, 2009 | Air Conditioners

1 Answer

Fan won't run, and buzzing sound


Motor's shot. New motor and capacitor should fix your problem

Jun 07, 2008 | Ruud UAKA030 Air Conditioner

1 Answer

Fan not blowing


Even when the power is off at the unit outside the thermostat will supply power to the contactor of the outside unit. This may give a hum or buzz as you stated. If when the power is on to the outside unit the fan tries to start but only hums the motor may be bad. Does the compressor start and run?

May 06, 2008 | Weather King 10AJA2501AH Air Conditioner

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