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Air conditioner and fan will not come on ,when set a hum is heard for 15-20 seconds then shuts down

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  • Heating & Co... Master
  • 1,108 Answers

Sounds like a bad run capacitor on the outdoor fan motor. Compressor kicks on but quickly overheats because fan is not running. Good Luck!!

Posted on May 12, 2017

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Posted on Jan 02, 2017

farfield
  • 462 Answers

SOURCE: CARRIER MODEL 38YCA030370 MAKES HIGH PITCH ELECTRICAL HUMMING NOI

Yes it could be the pop off pressure relief on the compressor.
I assume it is the outdoor fan your referring to not running.

If this is a heat pump and it is in defrost (only in the heating mode should your outdoor fan be off and then for only a max of 12 to 15 minutes).
If it is just AC ir is Heat pump in cool mode, the out door fan should run while the compressor and indoor fan are on. Until the thermostat is satisfied on room temp.

This high pitched squealing is indicative of a bad fan motor or capacitor for the out door fan motor. Kill power and test blades to see if turns free. Check the run capacitor inside control panel. It is usually silver or aluminum colored (some are painted gray). The top should be flat with rolled edges and the sides should either be round or oval shaped with no swelling or oil leaking from inside it. If this all looks normal take it to where your going to get a motor any way and ask them to check it or sell you a replacement at the same time. These can go out usually from high voltage (lighting...) or from over heating (bad fan motor, dirty out door coil...).

Hope this helps you if not post back I'll respond as soon as I can. And please rate me as high as you can. Thank you for using Fix ya and good luck.

Posted on Mar 28, 2009

plnolte
  • 62 Answers

SOURCE: AIR CONDITIONER MAKES BUZZING OR HUMMING SOUND

Yes probable you may need a new fan motor but check the capacitor first.

Posted on May 12, 2009

  • 93 Answers

SOURCE: Compressor hums but fan not turning. Pushed fan to

cap most likley

Posted on Jul 16, 2009

  • 3 Answers

SOURCE: 2003 Infiniti G35. Radio turns off, air conditioner full blast.

That happen to me too i just fixed last week
the thing is that you have to change the fuse in infiniti there is 3 place of fuses first one is inside the car, Second one is infront of the battery and the third one is next to the battery so for the radio and A/C one is the infront of the battery open and change the fuse number 15 that will be fixed...

Thank You

Rahim Faiz

Posted on Oct 27, 2009

  • 233 Answers

SOURCE: 38CKC036 Air Conditioner: outside fan will not come on makes a humming noise...

If the humming is your compressor running (feel the large copper line going into the unit, it should feel cold aftter a few minutes of run time) then the fan motor or the capacitor or both need to be replaced, check for voltage to the fan motor when the unit is "humming" if it has voltage and will not start replace the fan motor and the capacitor. hope this helps.

Posted on May 21, 2010

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1 Answer

Why does the compressor hum after the fan shuts down?


is it the compressor or contactor. they will develop a hum sometime.

Aug 09, 2015 | Heating & Cooling

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My air conditioner has stop working its blowing air inside but the fan is not spinning outside .....


If the fan is not running is the compressor not running also...if neither is running the possible reasons are 1..no power to outside unit...2..bad contactor on outside unit.is this buzzing if it is this indicates no power...3 bad capacitor,do both compressor and fan humm then quit humming and hum some more...4 high pressure switch has shut unit down because fan wasnt running if compressor was running but not fan....if your unit has this there will be a manual reset button where the lines come out of unit...if compressor was running and fan was not...1 bad fan...2 bad capacitor.. if you do not have any electrical knowhow i would recommend calling a hvac tech to come and fix unit...Thanks

Feb 01, 2011 | Samsung AS18A6RB Air Conditioner

1 Answer

The fan is not turning on my outside air unit but it is still blowing hot air through the vents. There is also ice build up at the bottom of the unit. It is making a humming sound.


You will need to replace the outside fan,or condenser fan motor.
Shut unit down,before the compressor gets damaged.

Without the condensor fan the heat will not be blown to the outside air and the unit will not cool.

You may be low on freon too,have it checked.

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I have a Mach III. Unit blows hot air and bogs down when cooling.


probably (90 %) the compressor's bad, depnding on the repair cost you probbly want to just get another AC unit

Aug 30, 2009 | Coleman Mach III Air Conditioner

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Hums and freezes up????


The fan motor must have been stopping. If the fan stops, for sure the fins will freeze because there is no air flowing. common Fan motor problems defective bearing or bushing and starting condenser. If the bearing is defective, it will heat up and seize. Have the fan motor checked. The fact that the fins are freezing, means that there is enough freon and the compressor is working.

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