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Outside unit motor hums but will not turn - Carrier 38CKC042 Air Conditioner

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Check the circuit breakers first. Then check the fan capacitor. If the capacitor is good then check the fan motor. Also make sure the fan rotates freely.

Posted on May 30, 2010

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Outside unit will only run for a short amount of time with A/C before the fan stops turning and starts humming, squealing/screeching and the top of the outside unit gets hot.


The bearings are bad in the motor and after the fan runs enough it eventually gets hot, making the bearing screech and the fan locks up. Need to replace motor again. See if it has a warranty. The reason it gets hot is because the fan is what removes the heat from the coil and if the fan isn't running there is nothing to cool it off so to speak.

Apr 19, 2016 | Heating & Cooling

1 Answer

The fan outside is not working but it's not locked


What voltage is the unit it could be the capacitors for the fan motor is bad or a bad fan motor. my guess is the humming you are hearing is from the compressor. There should be two copper lines going to the unit feel the temperature with your hand and see if the bigger one is cold. If it is it means your compressor is making that humming sound. but i need more info. could be a number of things bad contactor.

Aug 13, 2011 | Heating & Cooling

2 Answers

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.

May 18, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

Carrier Compressor Issues?


When you shut it off and back on it slugged the compressor if you turn it off and back on before the pressures equalize between the high and low sides it will slug the compressor and it will not run should let sit for five minutes or so before restarting. The humming is either the compressor making noise usually common for the compressor to make some noise or the fan motor bearings are getting bad on the outside unit. If the unit works normal probably not much you can do till it breaks if it is the compressor it is more economical to replace the whole unit if it is just the fan motor it is worth changing. You could take an amp draw on the fan motor and the compressor to see if the are within the limits on the name plate of the outside unit.

Jan 25, 2010 | Heating & Cooling

1 Answer

Outdoor unit hums but fan doesn't turn. Nothing heats up but the fan just won't turn and is there a spot to oil the fan on the motor


The fan motor on the outside unit should be a sealed motor. If the unit is just humming is the humming from the compressor or from the motor being locked up. You could try spinning it a few times with the power off to see if this might get it to run and spray some penetrating oil under the fan blade right where the shaft comes out to the fan blade.

Dec 24, 2009 | Heating & Cooling

1 Answer

Air on heat pump not cool outside unit humming but not kicking on


This could be an inoperative condenser fan.System will kick off on high pressure without proper air flow.The hum indicates voltage is present. Providing the fan motor is not locked up and will spin,Check your run capacitor which helps boost the motor voltage initially and will get it turning.If the cap is good,you may be faced with motor replacement....good luck

Aug 19, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

The outside unit of a whole house air conditioner


replace start run capacitor of motor fan

Aug 17, 2009 | Heating & Cooling

1 Answer

My outside ac unit is humming and warm..but fan not turning!


Souns like the compressor is running but the cooing fan is not. First you should see if the fan is blocked . Then see If the fan motor is getting power. If the motor is getting power it could be that the motor is bad. If the motor needs a capacitor to start that could also be the problem. Look for a cylinder shaped protrusion on the side of the motor. If these all check out then whatever tells the fan motor to come on is not working. Sorry but I cant help with that. Good luck!!

Jul 05, 2009 | Heating & Cooling

2 Answers

My outside unit is not actually working. It is


Hey, there. So, you have a hum outside, is your fan motor running outside? Does the compressor run and stay on, it is louder than the fan motor. The two pipes coming from the unit, the small one should be warm, the big one should be cold. Let me know what you got

Jun 20, 2009 | Ruud Matching Split Air Conditioner

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