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My unit runs fine but when I turn it off, the motor keeps running with a low hum.

It sounds like the compressor and I don't want to burn it up.

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  • Refrigerators Master
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It's not a compressor, this is a fridge fan.

Posted on Apr 24, 2015

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Posted on Jan 02, 2017

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1 Answer

Outside unit starts but stops running in a few minutes. The rest of the a/c seems to be fine but doesn't cool


there could be quite a few problems with it. either it has something to do with the high or low safety pressure switches. Or you have a low voltage issue-not getting enough low voltage power to the coil of the contactor. how long do you wait after you turn the unit on? there is a 5 to 10 minute delay in the control board to keep the compressor from short cycling. meaning to keep the compressor from turning off then on again right away. short cycling a compressor too much will ruin it. There also could be an issue with the delay board it self. Or its a heat pump it could be an issue with the defrost board or the defrost sensor. I have even seen it to have a short in the wires of the coil of the contactor. But when that happens it will burn out the transformer or the low voltage fuse of the transformer or on the control board.

have you got it figured out already? If not can you give me more info on what it does? Or if it ever comes on after you wait at least ten minutes. Can you hear the hum the coil of the contactor makes when it is calling for the cooling. you might even have a problem with the contacts of the contactor not getting the proper power thru it to turn or keep the unit on.


Like I said there could be quite a few different possible issues with it to not stay on.

Apr 13, 2013 | American Standard WCZ036F Air Conditioner

1 Answer

My carrier 38CKC (60) is blowing hot air. The fan seems to be running fine. Is it the condenser coil, or just needs freon? How do I know? The unit is about 8 years old and never been serviced (I know...I...


Assuming the outdoor unit is running, make sure the fan motor on top is turning and the compressor is running. They both must operate for the unit to function.

The easiest and most common problems:
1. Condenser coil is stopped up with dirt. The condenser coil is the radiator looking coil that wraps around nearly the whole outdoor unit. It can be washed out with water and a sprayer, just make sure you don't bend the aluminum fins and disconnect power before washing it out.
2. Low on refrigerant. If you don't have guages you can't check the refrigerant on your own. If the fan and compressor are running , feel the bigger copper line coming from the outdoor unit going into the furnace. It should be cold. If not you can either be low on refrigerant or the compressor valves are weak.

Hope this helps. If the unit is not running outside, repost and I will try to diagnose differently.

Jun 16, 2011 | Heating & Cooling

1 Answer

The motor runs fine with the belt off but when the compressor is on line the motor hums and trips the house breaker.


Turn the compressor pump pulley by hand (with belt off) and air pressure in the tank. It should be very easy to turn. If it is hard to turn, evaluate the check valve for leak. If no leak examine crank bearings for damage. Repair as needed. If easy to turn fault is with motor. Check amp draw with belt removed. When the motor comes on, it should draw about 15 amps and drop lower. The motor should start and reach full rpm in a split second. It should start with a bang and run smoothly with-out getting hot and only pull low amount of amps. If slow start and high amp draw, check capacitor/s and or start winding switch inside of motor. Sometimes the start switch will burn the contacts and give trouble. If both capacitors test within 95% of value and start switch appears to be good, look for damaged copper windings. Windings will be discolored or burned and the tie strings binding the windings will be melted. Replace as needed. Good holidays

Dec 15, 2010 | Dewalt d55170 Electric powered air...

1 Answer

Unit runs for about 5 min the cuts off. whats the problem?


Hi!!
It could be many things, the most common are Low R22 refrigerant, bad fan motor, bad compressor. obstructed condenser coil, bad starting relay, bad capacitor. among other things.
To check fan motor, set unit to HI Fan Only setting and let it run for a while, check that fan did not loose speed and it is not getting too hot.
If fan is OK, then turn unit to HI Cool 60-65 degrees and see what happens. Hear if compressor kicked in or if just made a humming noise and stopped. if this happens, replace capacitor.
Keep me posted!! Rate this post!!

Aug 14, 2010 | Kenmore 72055 Air Conditioner

1 Answer

Fan does not run. Low power hum audible.


sounds like you have a bad run capicitor on your fan check if the cap is swolen and or any oil around the terminals thats usualy a tail tell sind thats its bad

Apr 08, 2010 | Dometic Rooftop RV 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

3 Answers

Unit was running and shut off. Now motor won't run. Seems to get initial click and then a hum.


Try trouble shooting it in this order
1. remove the v-belt connecting the motor and compressor
2. run the motor, if it runs well then check the compressor. try to turn the flywheel of the compressor by hand. if it turns alright then check the pressure switch.
3. check the setting of the pressure switch, it cuts off power to the motor when the preset pressure is reached, maybe it is set too low, adjust the pressure switch to a higher setting

Oct 18, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

Outdoor A/C unit fan


If the fan and compressor are shutting off. its possible its cycling on a low pressure switch. probably low on freon.

or you have a low ambient kit to keep pressures up during low outdoor temps while ac is running just the fan will shut off, however thats not a typical thing to have a residential system

Sep 20, 2009 | Heating & Cooling

1 Answer

My coleman mah 3 roof top will not blowon fan side


Sounds like you have either a bad fan motor or a bad fan motor capacitor. When you turn the unit on with the fan not working, the compressor (the humming noise) runs and gets real hot real quick resulting in the compressor cutting off ( the nothing after) on it's inside high temp switch. This is what the compressor is designed to do so that when this happens, it does not burn the compressor out. Replace you fan capacitor, give the compressor an hour to cool, then try it. In most cases and if I'm correct, the unit will run just like you want it to. Good luck.
Please rate solution

Sep 09, 2009 | Coleman Mach III Air Conditioner

1 Answer

Problem with this unit


The controll board for the unit is faulty. The contacts for the compressor are stuck closed. The humming is the compressor running when the unit is off.

Sep 13, 2007 | Fedders A6Q10F2B Q Chassis Room Air...

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