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Exterior fan hums,will run when started spinning by hand

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You need a new fan capacitor

Posted on Jul 14, 2009

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Sounds like a bad capacitor it will usually look like a silver pop can or oval like tha hooks up to the fan terminal check the voltage and mfd ratings and replace it should be under $20

Posted on Jul 14, 2009

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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

Goodman air handler ARUF036-00A-1A does not blow air in heating or cooling mode only hums/buzzes, what could it be?


Looking at the wall thermostat, you will see the fan switch that has two settings: fan auto, fan on.
You will need to place the fan switch in the fan on position for testing purposes.
This will make the indoor fan run continuosly, and never cycle off.
In the fan auto position, the fan will turn off when the thermostat temperature setting has been satisfied.
Remove the air handler access panel.
Is the air handler fan operating?
If the fan isn't working see if you can listen closely if it is humming, or can touch the motor to see if it is hot.
If it is humming and has a bad capacitor, you can tell this without having an electrical tester by spinning the fan wheel by hand.
Be very careful... making sure your hand won't get cut by the fan wheel spinning when it starts up.
If the fan spins and picks up full speed, replace the defective fan capacitor.
It is the shiny silver metallic cylindrical object with electrical wires attached to it.
Make sure you write down where those wires attach and turn the power off before removal as they carry 240 volts to the fan motor.
If you find that the fan wheel doesn't turn freely when you try to spin it by hand, the bearings have seized and you will need to find another fan motor of the same size, shaft length , speed , and horsepower to replace the defective motor.
Keep in mind that a humming sound in the air handler COULD be from the transformer instead of the fan motor.
The transformer is a black cube shaped device with electrical wires attached to it.
If the 24 volt transformer goes bad, your thermostat will not function and nothing will come on.

Dec 01, 2014 | Goodman Heating & Cooling

1 Answer

Air condition motor not going on


check to see if the fan is running if not it has frozen up over the winter. turn off fuses to a/c unit then try to turn fan by hand,if not soak down fan bearings with penetrating oil like PB Blaster keepmoving fan blade back and forth until it spins freely. Then try turning on the power to a/c unit if motor then turns fan freely , shut it down again and use a good coat of a-1 motor oil (ELECTRICAL) on the fan brgs. This should get you through for another year or so. On the other hand if fan will not spin by the motor now but spins by hand then the fan motor is bad.

Apr 14, 2013 | Carrier Payne 2.5 Ton Air Conditioner...

1 Answer

Dutchmen 2004 air conditioner hums but no air comes ot


Sounds like fan start capacitor may be shot. If you take cover on roof off, have unit shut off, and spin the fan by hand very carefully ,real good and then have someone turn it on immediately after, it will probably start up and run ok, until you shut it off again. Try that once and if it starts and runs, let it run for 10 minutes or so, then shut it off and try without spinning it by hand to see if it will start on it's own. If it does, it may be ok for a while, especially if it had been sitting , not used for a while. I've seen them get a dead spot from sitting and once you restart them they tend to cure themselves and be ok for who knows how long. Remember, Very carefully and quickly get hand away or use a stick if you can.

Let me know the result.

Aug 23, 2011 | Dometic Rooftop RV Air Conditioner

2 Answers

Outdoor fan motor will not run, MAKING HUMMING NOSIE


Hello, if you try to spin the motor by hand or with a stick and it starts then the problem is a bad capacitor, if it does not start then the motor is shot.

Jul 13, 2011 | Ruud UAKA042 Air Conditioner

1 Answer

My outside unit fan doesn't spin. i hear a clicking noise and a humming but the fan won't spin. i've tried to spin the fan and it spins freely by hand.


You may need a new start capacitor or fan motor.I would have the capacitor checked by a electrician and changed if needed. Good luck and thank you.

May 31, 2011 | Ruud UAMB Air Conditioner

2 Answers

Hums but wont fire


Remove the top cover, plu it back in and see if the hum goes away, if it
doesn`t look to see if the fan is stuck, if it is unplug and try to spin it
by hand, if it wont spin replace the fan motor

Feb 12, 2010 | Reddy Heating & Cooling

2 Answers

RV AC not working


With power off, go on roof & try spinning fan at rear through cover with a stick, or something, until fan has made 2 or 3 revolutions, then try fan mode only & see if it starts. If no luck, remove cover on roof (watch for bees & wasps) and spin fan good by hand a few times & try again, if no luck, replace fan start capacitor.

Aug 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Exterior fan doesn't spin unless lightly pushed. Is there such a thing as a 'fan clutch' that may cause such a problem? How is this problem repaired?


If it spins up to speed with a little help from your hand or whatever, then my guess is that a fan start capacitor is faulty. It gives fan a voltage surge/spike to get it up to speed from off.

Aug 17, 2009 | Amana PTH123B25AJ Heat Pump Air...

2 Answers

Reddy heater 110,000 btu forced air portable kerosene


try this, take off the top cover. plug in the heater and when the humming starts, rotate the fan sharply with a screwdriver. keep your fingers away from the fan. if the fan spins under power your start winding is shot. get a new motor. www dot desatech dot com

Dec 06, 2007 | Reddy Heater-30-55,000 BTU Variable

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