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A/C- when turned on inside on thermostat, outside unit hums (makes a sound as if it is trying to start but cant) does this sound like the contacts are closed/stuck together?

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Locked up compressor, the motor is trying to turn it but cant so it hums with electricity. Dont use until its fixed or it WILL catch Fire

Posted on Apr 16, 2015

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3 Answers

The AC makes a humming sound when starting the fan. If I spin it by hand it runs. Model 620315.321 serial 90716722.


The humming sound is the motor trying to start, if you turn it by hand, usually they will run. it sounds like the motor for fan needs cleaning and oiling. God-Bless ya all!

May 20, 2016 | Dometic Rooftop RV Air Conditioner

1 Answer

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

Goodman troubleshooting


which fan inside or outside hum sounds like compressor is running if outside fan try moving fan blade probably find it dragging or cant move bad motor

Sep 08, 2014 | Heating & Cooling

1 Answer

My breaker trips when the outside unit tries to turn on. The inside furnace runs. I cut the inside unit off and the breaker doesn't trip. I manually turn on the outside unit by depressing the cont


Hello, there is a short to ground somewhere, check all the wiring from the inside un it to the outside unit and make sure nothing is touching metal.

Jun 10, 2012 | Goodman Heating & Cooling

2 Answers

I have a goodman gsc13 ac unit about 4 year old. When the temp gets around 90 or above outside the fan on the unit starts but the compressor does not. I had service check it out but that day they were...


It sounds like the unit may be over charged. Make sure the outside coils are clean and you have plenty of airflow coming out of the top of the outside unit. What could be happening is, when the temps get higher outside, so do the pressures in the system. The compressor has a thermal overload protection that will kick the compressor off if it gets to hot, which if the compressor is over charged, it will work twice as hard, over heat and shut off. You would need a technician to come out and get the refrigerant charge back to normal. Another thing that could be happening is a weak or faulty capacitor, which is a small round or oval metal object, found in the electrical compartment on the unit. This are fairly simple to change out if your comfortable with electric. I've also had to put what's called a hard start kit on compressors with the same problem, new and old. The hard start basically gives it that extra boost of power to get it up and going. I would start with the refrigerant charge and go from there. The electrical "humming" sound that you hear unless you turn the breaker to the furnace off, is the contactor on the outside unit having a call for cooling. The 24 volts come from the furnace, to the outside unit, and pulls the contactor in to power the unit with the 220 volts supplied. It is normal and you don't have to worry about that at all. I hope some of this helps and good luck!

Jul 05, 2011 | Heating & Cooling

1 Answer

Yes I turned all switches off but the motor is still running, what should i do i cant afford a technician today


the thermostat operates a relay (usually in the outside unit) .. sounds like your relay has stuck contacts. you can trip the air conditioning circuit breakers to shut it down for now .. you can try tapping the relay with a screwdriver handle to see if you can break loose the contacts .. or better, you can replace the relay .. its also possible that the thermostat has a shorted contact .. disconnect (or unplug) the thermostat and see if the motor stops .. if it doesn't then suspect the outside relay .. if it does then replace the thermostat .. make sure the wiring to the stat is ok ..

Sep 26, 2010 | Heating & Cooling

1 Answer

No cold air-the compressor unit outside does not come on.


I believe the soft hum you are hearing is the contactor pulling in. You can check by standing by the outdoor unit and have someone inside turn the a/c on and off at the thermostat. If the contactor is being energized you will hear a distinctive click as it energizes or de-energizes. If this happens check your main power sources to the condenser. Make sure the circuit breaker in the fuse box is turned on. Also check your outside disconnect box that connects to the condenser. Remember this is high voltage so be careful. A lot of these disconnect boxes have cartridge fuses inside of it. You will need a voltmeter to check the continuity of the fuses to make sure they are ok. Just one being bad could make the condenser inoperative. If you need to change the cartridge fuses, make sure you put in the exact size needed. putting in the wrong size for you unit can cause problems. Always buy "time delay" fuses . They cost more but they will not blow out on initial start up like the cheap ones will. I hope this info helps you....
Good luck...

May 01, 2009 | Weather King 10AJA6001AH Air Conditioner

3 Answers

Heat Pump hums, clicks and does not come on sometimes


yes the start capasitor starts the fan motor and the contactor pulls together when the t-stat tells it to start and it has a spring in it that gets week , some brands of units have a delay in the outside units board to stop it from starting at the exact same time as the airhandler

Jan 08, 2009 | Heating & Cooling

2 Answers

Outside unit will not operate


Sounds like a bad fan motor. Inside fan runs, compressor runs. Outside fan. Are your contactors pulled in when thermostat set on cool? If not might be a contactor. If contactor not pulled in touch the top of it with the end of a screwdriver. If fan spins turn unit off a buy a contactor...

Tip: Always make sure power at disconnect is off

Jun 10, 2008 | Carrier 38CKC042 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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