Question about Dometic Rooftop RV Air Conditioner

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My Dometic rooftop A/C does not run at all - fan or compressor. What can I check? Does the 12v system have anything to do with it running?

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  • Dometic Master
  • 6,674 Answers

Yes, possibly, if you have wall thermostat. If controls are all at ceiling/manually, then 120VAC power should be all you need. If wall thermostat, you will require 12 VDC, or 24 volt transformer system for it to operate. Usually towables have 12 volt, and park models etc, use a 24 volt transformer in the system. If you hear clicking when trying to run it, on off etc, check 120VAC source, such as breaker wiring to it .

Posted on Nov 29, 2013

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Posted on Jan 02, 2017

  • 127 Answers

SOURCE: Compressor doesnt come on in a dometic duotherm

If this is a wall thermostat controlled unit, then check to make sure that you have power coming from the yellow wire on the thermostat when it is placed in the Cool/Auto High mode. If you do not have power at the yellow wire, then you have a bad thermostat. If you do have power, then remove the control unit from the inside of the AC and see if you have power at the Y terminal there. If so, when you turn the thermostat to cool, can you hear a relay clicking in the box? If not, then you have a bad control box. If the relay is clicking, you need to check the power at the compressor relay on the board. It has a black wire to one side and a purple (or blue) wire on the outgoing side. Check to see if you have 120V on the blue wire when the tstat is set to High/Cool. If not, then you need to bypass the freeze switch to make sure that is not the problem. If you do, then you need to go upstairs and check the start capacitor for OK. It is located in the side compartment of the upper unit, it has a small black relay on the top called a PTCR. These often burn out and will cause the compressor not to work. If that is fine, then you go to the top of the compressor to the thermal overload switch. See if you have power at both sides, if so, then you have a bad compressor. If not, then the overload switch is open and not allowing power to the compressor.

Posted on Jul 04, 2009

22yooper
  • 828 Answers

SOURCE: Fan runs, shuts down on cool

Sounds like a power supply problem. There is enough power to run the fan but when you turn it to cool the current draw by the compressor drops the voltage. The lower power light is telling you the answer to your problem.

Posted on Jul 18, 2008

SOURCE: I have my dometic Rooftop AC unit. The

Let it cool off.Install a hard start kit on the run capicator.Its only 2 wires & easy to put on.It should kick over.

Posted on Mar 16, 2010

motor1258
  • 6674 Answers

SOURCE: I have my dometic Rooftop AC unit. The

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?

Posted on May 09, 2010

  • 397 Answers

SOURCE: 3+ year old 15K rooftop

It sounds like a short in the fan motor windings. The fan will remain free if that's the case, but it will not operate and will trip the breaker.

Posted on Jun 30, 2011

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