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james Posted on May 12, 2015
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Compressor is just humming all the time, even when blower kicks off.

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  • Anonymous Jul 06, 2015

    I have to agree with Johnny on this one. Air conditioners on RVs aren't the same as residential AC systems. If you take it to an RV repair service, they'll be able to they'll be able to find out where the humming is coming from. Not only that, but they'd probably be able to fix it as well. I'd definitely recommend getting it serviced. Good luck to you, James! http://www.orangewoodrv.com/pages/servic...

  • Steven
    Steven Jul 23, 2022

    Battery 12 v? If it is thermostat, motherboard has fuse?, Motherboard shorted under black? Converter good ,,,? Good Luck

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3 Answers

David Spradling

David Spradling

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  • Dometic Master 13,524 Answers
  • Posted on Aug 19, 2022
David Spradling
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Possible bad start up capacitor on compressor or bad compressor

ifixalot4her

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  • Contributor 46 Answers
  • Posted on May 20, 2015
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Need alot more info. Analog or digital thermostat? Does it do it when you command the thermostat or does compressor just start when you plug your unit in to power?

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johnny rebel

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  • Dometic Master 10,875 Answers
  • Posted on May 12, 2015
johnny rebel
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Related Questions:

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When the compressor tries to come on, why does it click and hum, then clicks off?
Two causes for that situation. The compressor has a start relay and a overload mounted on the 3 prongs. When the relay/overload is bad, compressor will kick on, hum, then a click sound. The click is the overload. Or, the compressor is drawing too much power and the compressor is bad. 90% of time it's the relay/overload but you need to check and make sure fan is running by compressor and coils underneath are not clogged up. Poor air flow around compressor can cause overload to go bad.
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Aug 19, 2015 • Refrigerators
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Sounds like somethin has bound up the fan causing the automatic circut breaker to open. Open up the fan housing and clean it out.
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The compressor is shot or out of freon so you will need to contact the Sears service department.
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Air compressor on Heil air conditioner is humming but not kicking in
Capacitor Failure Symptoms are sometime harder to identify without the right tools and expertise. Capacitors can be found in several different sizes and shapes. There may be one or multiple capacitors included in your ac with regards to the design. While the most popular capacitors are the types found on circuit boards, the ones most associated with air conditioning will be the bigger capacitors that assist start and run your motors. There are several motors present in an conditioner and heater systems:
  1. Compressor Motor Run Capacitor: Here is the most popular capacitor that fails. Most of the time these are duel capacitors, which means that there are 2 capacitors built into one. A duel capacitor will have three terminals on the top where a single capacitor will simply have two terminals on top.
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  3. Indoor Blower Motor Run Capacitor: Similar to the outdoor fan motor capacitor, it is a small, single (two terminals) capacitor that will help start and run the indoor blower motor.
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Oct 16, 2012 • Heating & Cooling
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Motor hums but won't kick in
Hi simpsonruth1..
In the back of the compressor motor you will see a fan, remove the plastic cover to get to it..
Once you have the plastic cover removed and the fan exposed, plug the compressor in and spin the fan with your fingers...be quick as the fan could cut your fingers if you do not get them out of the way..
If the compressor starts working, then the start capacitor is bad on the compressor...if it does not run then you have motor troubles, either replace the motor or get it rewound.
Please take time to rate me
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Sep 06, 2011 • Paasche 1/8 HP Diaphragm Compressor
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Our frigidaire window a/c unit (model faa067p7a) does not seem to be operating properly. There is no condensate forming anywhere (beneath the coils is dry and no evidence of water and there is no water...
It sounds like your unit is low on freon or the compressor is not kicking in. If the compressor kicks in you can hear it turn the unit on fan only or turn the thermostat off then turn the unit to demand cool you should hear a hum even vibration when the unit kicks in. If there is no audible hum ect... your compressor is probably not kicking in. The selector switch the temp switch the capacitor for the compressor or the compressor its self could be bad. good luck if you need to know how to test any of the above let us know
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Aug 11, 2010 • Frigidaire Compact Air Conditioner
1helpful
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Hello i have Carrier Weathermaker 38tkb air conditioner unit. It's about 6 years old and when i got home today, the unit itself wasn't working. Although the blower fan in the furnace inside was blowing,...
The humming noise and dimming of the lights is an indication something in the outdoor unit is locked up or has failed.

Check the capacitor as it may have gone bad. If the capacitor is good, then you either have a failed motor, a failed compressor, or both.


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Be the first to answer Jul 06, 2010 • Dometic Rooftop RV Air Conditioner
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RV A/C blower not working and keeps kicking out
If blower not working, and yoou hear a slight "Hum" with fan only on, try this. With power off to AC. Go up on roof, and slide a stick through opening on side near rear, and try to get to fan blades at rear of unit. try to spin the blades a few times, even if it only goes a little at a time. Unless you want to take all those screws out & remove cover to get at it better, but watch for wasps under there. Give fan a couple of full rotations, then have someone turn it on to fan only & see what happens. If fan finally works, let it run for a few minutes on fan, then try cool & see if it all comes together again. Let me know.
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Jul 17, 2009 • Dometic Rooftop RV Air Conditioner
0helpful
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Kenmore a/c window unit fan not kicking on with compressor.
Likely a bad motor, when this occurs verify the board is sending voltage to the motor.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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