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Central air unit is not coming on there is a buzzing sound inside it

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What causes a central air unit to get ice on pipes

Posted on Jul 12, 2008

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Rudd central unit , turn A/C on[therm. inside] all U can hear is a Buzzing noise coming from the outside unit , found that [1] capacitor wire had been BURNT , changed wire , then changed capacitor , turned...


Hello
Before you buy a new condensor fan motor check the contacts to the motor are not worn or pitted.

Hold or push the contactor in by using an insulated screwdriver and see if the fan motor turns.

Also the start cap you bought? was it the correct one meaning mfd micrfarad?

If all the above checks out ok then you need a fan motor,you can wire the motor direct to check it also.

From what you describe it sounds like the fan motor is burnt up and worn out,not uncommon.

Mar 22, 2011 | Heating & Cooling

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

Unit does not come on and shows signs of ice forming ion unit


ice means unit is running.
is inside unit running?
sounds like dirty filters on inside unit.
or lack of airflow

Oct 28, 2009 | Haier HC48C1VAR Central 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 | Heating & Cooling

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 Heating & Cooling

2 Answers

My central ac unit is blowing air that is cool but not cold


Ek chiz sukha ho to 2kg gila ho to 1kg and jal jaye to 3kg its urgent please

May 18, 2009 | Heating & Cooling

2 Answers

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.


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.

Jul 20, 2008 | Heating & Cooling

1 Answer

Compressor problem?


The buzzing is your compressor trying to start. It is going off on internal overload caused by heating up of the motor windings.If you have an amp meter you could check the amp draw of the comp against the locked rotor amps listed on the tag You could try to have someone test your run capacitor, which looks like a can. Could be round or oval with wires coming off it. Or try a hard start capacitor and relay to bust it loose if compressor rotor is stuck. If that doesn't do it the comp is bad.

Jun 10, 2008 | Ruud UBHC 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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