Question about Dometic Rooftop RV Air Conditioner

1 Answer

A/c hums when you turn on. a/c ran before then when shut off all it does is hum

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Two things to check. One: look for the start capacitor and make sure it is not blown out the top or black and burnt. There is an anticipatory on top of the capacitor also that could have burnt out.
Then make sure nothing on the out side stuck the fan blade in place and not let it turn. That is really three things, But the charge is never the problem on Roof top air for RV's. Small amount in the system leaks out fast if line bad. AC unit has no taps because it is a closed system not designed to recharge. That doesn't you can't charge the system, it just means someone telling you to tape the line just to test pressure is not really going to fix the problem. Air flow and cleanness of unit on evaporator and condenser is important. You can hear the compressor running if is working. If fan not turning check for being stuck.

Posted on Jun 06, 2010

2 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 51 Answers

SOURCE: duo-therm mod # 57915 not cooling fan?????

need to get at the capacitor for the fan. Try spinning blower when it hums. If it runs then the cap is bad if not the motor.

Posted on Aug 14, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2001 chevy malibu had been working fine up until this afternoon it turns but wont start,itmakes ahumming noise even when i turnoff key.

That humming noise may be your fuel pump burning out. Try turning the key to the on position while someone else listens near the gas tank. The humming should only hum for a few seconds so you won't have time to listen yourself unless you can hear it from inside. If the hum continues and doesnt shut off, it is likely a bad fuel pump. It is normal to hear a small hum for a couple of seconds , but when it starts getting weak, it will hum louder, longer, or not at all

May 11, 2015 | 2001 Chevrolet Malibu

1 Answer

My water pump is only humming not working

the humming means the power is getting to it, but for some reason it is not spinning, if it ran dry too long the impeller may have melted.

Dec 26, 2014 | Goulds Pumps Pump Centrifugal 1/2hp

1 Answer

I have a Goodman a/c unit. Fan stopped shut off

replace the motor the bearing has seized up.

Aug 27, 2014 | Heating & Cooling

1 Answer

Motor hums but blade will not rotate

Sounds like a start capacitor.

Feb 19, 2012 | Saws

1 Answer

Something is draining the battery in my Trailblazer

The hum could be your fuel pump. Listen to see if the pump is shutting off. Sometimes they'll run for a little bit after the car is off. If it isn't stopping, then it may be a fuel pump related issue.

Nov 30, 2009 | Computers & Internet

1 Answer

Duo-therm mod # 57915 not cooling fan?????

need to get at the capacitor for the fan. Try spinning blower when it hums. If it runs then the cap is bad if not the motor.

Aug 13, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Autoleveling system in '89 Town Car is hissing and humming. Is there a fuse shut off or manual way to set this? Never tow with car, never will, and will never have heavy loads...ran battery down, is...

the hiss is probably an air leak in the system and humming is the compressor...if you shut it off the car will probably lower to the ground and be undrivable

Jun 14, 2009 | 1997 Lincoln Continental

1 Answer

Samsung ldp 46 " replaced lamp humming sound fans cleaned and working set continues to turn off every 20 min or so

Humming problem with a Samsung DLP HL-P5063W
picture displays good
Humming randomly starts, but once it starts it hums

May 31, 2009 | Samsung DLP HL-P5663W 56" TV

1 Answer

My new Amana compressor Central Air-Heat Pump hums very loudly

When it hums, is it running? Or does it not run when it hums? I'm assuming it runs when you say you have to turn the therm off to get the noise off.. If it's humming and not running, you have big problemo friend..

Dec 02, 2008 | Amana PTH123B25AJ Heat Pump Air...

Not finding what you are looking for?
Dometic Rooftop RV Air Conditioner Logo

183 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Donni Steen

Level 3 Expert

659 Answers

mike cooper

Level 3 Expert

884 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides