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When i turn on my aircon the fan won't work but the compressor is working... i heard humming sounds and there is no air comes out.

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You could have a bad condensor fan motor..... Shut the AC off at the Service disconnect and spin the blade on the fan motor and then while it is still turning turn the AC back on if the motor takes off and starts to run then you have a run capacitor out. Which is a cheap fix. Also on some model they add a fan cycle control to help the AC main tain head pressure in low ambient conditions. It will start on its on when the head pressure makes the pressure switch and then shut off if the pressure drops below its set point.....

As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician or HVAC tech to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.

Posted on Mar 17, 2011

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1 Answer

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Your compressor ismounted or rubber feet. If one or more of these rubber spacers is gone or loose you need to come up with some more. If these are still n place its possible that the compressor (which is mounted inside the black oval or round case) may have a broken spring. In this case its compressor time Im assuming your fan is ok as you say its only when the cooling is on. Only 4 things move on the AC 1= inside fan 2= outside fan 3= fan motor and 4=compressor& compressor moptor which are in 1 case. 
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OH yes FYI if the outer case of the compressor is round you have a rotary compressor and they arenatorious for being loud and viberating even when new. If you decide its inside the compressor Id suggest replace the whole thing cause the compressor viberation causes tyhe copper lines to become hard and can crack eaisly.  Hope this helps. PLEASE Grade me ACCORDINGLY and good luck. 

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