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When RV is plugged-in a loud humming accures nothing to do with air conditioner. Normal?

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It is your power inverter,it converts 120 volts to 12 volts,to run your fridge and lights etc.

Posted on May 01, 2015

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A solenoid (magnetic contactor), a motor, or wires can produce chattering sound. I think most likely you hear a solenoid that transfers the RV load from one source to another. A manual transfer switch would be quiet.
Electric alternating current solenoids have laminations that can loosen from each other thru vibration and aging, becoming noisy, and are noramly buzzing when energyzed even when new.

Posted on May 01, 2015

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1 Answer

When my RV is plugged in, is it normal for the air conditioner to hum?


while in cooling mode, with refrigerant compressor running, yes. An inspection of the controls with special attention to the compressor magnetic contactor, this contactor may be extra noisy and can be replaced in attempt to quiet the air conditioner down.

Apr 30, 2015 | Heating & Cooling

1 Answer

Extremely loud, unbearably loud Dometic a/c 2010 Thor Outlaw


have some one remove cover on roof to track noise down.

Feb 08, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

I have my dometic Rooftop ac unit. The heatstrip/fan run perfectly but when I turn on the ac...the fan runs good but when the compressor kicks on it just hums.


The compressor coming on does make a slight "humming" sound which is normal. Is the unit cooling properly? Do you think it is louder than before?

May 09, 2010 | Dometic Rooftop RV 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

I have a dometic roof mounted air conditioner 3300 series and it developes this vibration like a real loud hum


sounds as if the fan motor bearing have worn out lettin the fan cage wobble upon reaching full speed hence the vibration. There also could be build up of debris in the fan assembly. Good luck on your repairs

Dave

Oct 16, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Have a coleman rooftop unit a/c unit, after about an 1 hr. unit hums no air comes out


COLEMAN R.V. AIR CONDITIONER SERVICE AND REPAIR QUESTIONS
COLEMAN R.V. PRODUCTS
GO TO rvcomfort.com

Click on RVP (RV PRODUCTS)
Click on type of AC, if you can’t find the information you want there,
then click on contact us on the Green Bar.
You can get Service Support or Email address and Phone numbers.

Jun 07, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

RV Rooftop AC Unit


Sounds to me like your fan is hitting something
Remove the cover and turn the fan by hand ( with the power off ! ) See what it is hitting

Oct 24, 2008 | Dometic Rooftop RV Air Conditioner

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