Question about Dometic Rooftop RV Air Conditioner

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Compressor does not come on or fan, 110 and 12 volt are present at wall unit, heating units, but air does not click on or respond

Duo-therm Unit # 59516.501 Product # 991.731.749 serial # 52519748 Control Box # 3104998.004 Serial number E9390547 Purchased and was told that it kept things really cold, but brought it to Houston and air conditioner is not coming on, Heater works just great..Did not try Air in Tulsa, too cold to turn on, darn! should have!

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  • Dometic Master
  • 10,764 Answers

Is fan on auto

Posted on Nov 23, 2017

  • David Spradling
    David Spradling Dec 03, 2017

    if on auto check voltage at compresser

  • David Spradling
    David Spradling Dec 07, 2017

    make sure dip switches correct



5 Suggested Answers

Donni Steen

  • 687 Answers

SOURCE: Duo Therm compressor tries to start and kicks out

I don't think these little units have a start capacitor but what I would do is check that the on/off switch wires to make sure they aren't loose. Also check the wires to the compressor for loose wires as well. It is possible that these are the first signs that the compressor is about to fail. They also can act up some when they haven't been used for awhile and then you try and start them up. Try running the unit for a few hours without asking it to cycle. It might just be a sticky valve.

Posted on Apr 13, 2009


Mike Butler

  • 6674 Answers

SOURCE: AC won't run on low speed

It may not be wired for low & high fan mode. If it always did before, then yes there's a problem.

Posted on Jul 19, 2009

Jay Repko

  • 2 Answers

SOURCE: duo therm ac problem

Same problem. I have a 2005 on a Rockwood Roo. Worked fine in October 2009. Not working June 2010. Problem is not a freon leak, compressor went bad. I banged the compressor gently with rubber mallet then with a hammer but that did not work. The fan runs, the compressor runs but gets hot. Also no indication of freon moving through system as everything gets warm from the compressor outward.

Posted on Jul 25, 2010

Brian Niten

  • 674 Answers

SOURCE: Duo Therm 59516 Roof A/C

First make sure the breaker isn't tripped. Next use a voltmeter to check for power on the primary and secondary side of the contactor with it pulled in. If you have power then check the capacitor. If it looks swollen then it is bad or you can check it with a multimeter with the capacitor test function or take it to a heating and air supply and they can check it for you. If the capacitor is good and you have power, then use an ohmmeter to check the motor windings for continuity. Locate the common wire and connect one meter lead to it. Then connect the other lead to the start winding and read the meter and then connect that lead to the run winding and read the meter again. You should have some resistance on both. There will be more on the start winding than the run winding.

Posted on Sep 03, 2010



  • 1 Answer

SOURCE: my dometic duo therm brisk air RV a/c unit is not cooling the RV

I had the sam problem, took the thermostat cover off and tightend and refastend the wires, so far so god

Posted on Jun 19, 2012

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Domestic duo therm gets 20volts everywhere I checked. I have yet to check the switch on top of the compressor. Neither fan nor compressor turn on or make noise. Get 120 at breakers.

If you don't have 120 volts at the power connections at the unit, you have an open fuse or wire someplace between the breaker and the unit.

Jun 24, 2014 | Heating & Cooling

2 Answers

My dometic duo therm brisk air RV a/c unit is not cooling the RV

I had the sam problem, took the thermostat cover off and tightend and refastend the wires, so far so god

Oct 27, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Duo-therm fan only runs on low

useually a sticking fan relay in the controll board this is the closeest unit to a home based cenral air system and i would leave this one to the experts if you want to trouble shoot there is a detailed wiring diagram on the back side of the pc board cover on the fan and compessor unit it self there is a seperate relay for each speed on your unit make sure getting power to selected relay if not trace wiring and do continutity tests back to themostat

Jul 28, 2009 | Dometic Rooftop RV Air Conditioner

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