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Posted on Aug 01, 2009
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Fan does not run motor just hums - Dometic Heating & Cooling

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Anonymous

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  • Expert 166 Answers
  • Posted on Aug 01, 2009
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The humming of the motor may mean either that the motor is in need of some oiling (as may be applicable,some A/C's do not include this option) or the motor is just about dead and in need of replacement. Your best and most logical action to take would be to get free estimates from local AC/HVAC contractors in your area who could iin the position to fix it for you (or whom you can rely on to get as much infromation as possible during the free-estimate consultation so as to apply the information for your own use). The rule of thumb is to get at least three estimates.

For your convenience, here is a handyman site that I came across, which has a section dedicated to air conditioning, where you'll find a text-link ad that offers up to Four (4) Free Estimates from such local contractors in your area (scroll down a bit and it's the text-link towards the middle of the page):
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Home_Improvement_Zone_Cooling_Ventilation_Systems_Central_Air_Conditioning.htm

Click on the "A/C Contractors" text link. Again, guessing on here is not as productive as getting a quote on the basis of a professional diagnosis from an expert upon which you can rely.

laspeyrer

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  • Expert 128 Answers
  • Posted on Nov 02, 2014
laspeyrer
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Take the outside cover off and examine the fan to see if does not have some kind of obstruction ,Mud dobbers or known more as dirt dobblers can build nest of dirt from the fan blade to the unit housing causing the fan to stop turning causing the hum.

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1answer

Thermostate kicks pump motor on ok. but when its time for the fan motor, all you here is a loud humming then the breaker blows

check for a failed start/run capacitor for the motor
if the motor spins freely then the humming will be a frequency hum because there is not enough power to start the fan running
the extra current will blow a cb
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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.
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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.
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Humming sound? motor or fan constantly running

Hi, It is the evaporator fan motor you are hearing. The motor is the only thing that shuts off when the door is open. The fan motor is located behond the rear panel inside the freezer sections.
I hope this helps you. Please let me know if I can assist you further.

Vic
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Ac unit is humming fan is not turning

hi there,
defective fan motor,this means stuck up motor the running winding is functioning but it can't star to drive your motor so the current inside motor produce vibration that why it create humming, several causes to be consider, bearing are worn out,defective fan capacitor, the fan is obstructed by object.there is no supply on starting capacitor,check if there fan relay overload protection reset it on control panel,
also,if humming is came from compressor,definitely because
fan is to reject heat,if no fan compressor will hum due to refrigferant in the system is not flowing,on high side,have this check by a/c technician nearewst on you.have a nice day dont fforget to rate me ,thank's
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FAN MOTOR

The run capacitor is probably bad. The run capacitor is usually a two part component. One part serves the fan and one part serves the compressor. Sometimes when they fail the fan will even run backwards instead of just stalling. Replace it.
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might want to check the fan motor start capacitor
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Depress the door switch for the fan and light and the light should go out and the fan motor should run. If the fan motor does not run but only hums it may need to be replaced.
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