Question about Dometic Rooftop RV Air Conditioner

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Air conditioner just hums

Air conditioner worked fine with first use now it just hums, will not run properly.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 230 Answers

SOURCE: blower motor in home air conditioner does not work

The most common failure for this problem is either the start/run capacitor or the fan motor. IF YOU ARE NOT experienced with electricity then I would strongly suggest hiring a technician. The volts are 220 with a potential of 50 amps in a common residential unit.

If you are knowledgeable in this area then make sure the motor has volts to it. If it does have volts and does not spin, it is bad. You can sometimes tell by feeling the motor it will probably be very hot. The compressor will eventually shut itself off when it over heats. It usually will restart after it cools down(sometimes many hours). The motor and capacitor are pretty generic and can be matched up at a local Grainger store or whatever Retail, specialty store that you have in your area.

I hope this helps:)

Posted on Jun 25, 2008

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  • 1 Answer

SOURCE: duo therm air conditioner

My problem is the fan never goes off runs 24-7 and you can hear the compressor kick in from time to time. Is something wrong or do they all do that for a roof top unit? Any help on this one?
Frank

Posted on Jul 19, 2008

motor1258
  • 6674 Answers

SOURCE: Air conditioner fan will not come on and unit will run for 1 minute and stop

You hear the compressor kick in (Hum) but no fan comes on? Will the fan come on when just in fan mode, not cool, or do you have that set-up?

Posted on Aug 14, 2008

  • 147 Answers

SOURCE: heat controller mini-split air conditioner

Check each screw on your compressor to ground (compressor case). Should be very high resistance Then check the resistance across your teminals on the compressor to be sure it is not shorted. Then check the wiring to your capacitor (The big one). I ran across this just last week. The mechanic didnt have the capicator wired correctly. If it is brand new it will have a wiring schematic somewhere on it.
Dont leave the compressor on very long, but turn it on long enough to get a voltage reading across the terminals. I assume it should be 240 volts. If you have check all of this, they make a jump start gadget to start a stuck compressor. They sell it just about everywhere. Let me know how this comes out..

Posted on Sep 30, 2008

  • 5 Answers

SOURCE: Blueway split system wall air conditioning doesn't work properly.

need to add refrigerant
need to check wheather the ampere is the same on the name plate
check the room temp. setting
check the setting of the timer

Posted on Jan 26, 2009

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1 Answer

My rooftop air conditioner is making a humming noise, but will not blow out air. The fan will not kick on manually from the thermostat. The humming stops when I turn the thermostat to off.


check the capacitor of the fan motor may be it was bust u can see physical by the size bulge if u found damage. change it to new one with same rating then it will fix your humming problem.

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Sounds like possible fan capacitor failure. If your not familiar with capacitors, please find someone who is, as they can give a fatal electrical jolt if not handled properly.

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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?

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I have a Mach III. Unit blows hot air and bogs down when cooling.


probably (90 %) the compressor's bad, depnding on the repair cost you probbly want to just get another AC unit

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This could be an inoperative condenser fan.System will kick off on high pressure without proper air flow.The hum indicates voltage is present. Providing the fan motor is not locked up and will spin,Check your run capacitor which helps boost the motor voltage initially and will get it turning.If the cap is good,you may be faced with motor replacement....good luck

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The compressor may be fine after setting off or a day. After retyring it then if it still dosnt start either replace the run capacitor to the compressor and fan motor or have it checked to see if it is in range.

The hum your hearing could that be the contactor relay humming?

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Sounds to me like the contacts that are humming. Check your fuses or breaker.

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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..

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