Question about Dometic Rooftop RV Air Conditioner

1 Answer

A/c turns on for 10 minutes

I have a dometic 595 Series quick coolWhen I first turn it on, it runs great (air from duct is cool and temp in camper starts to drop).After 5-10 minutes fan and compressor turn off.Then the fan turns on but no a/c. Then fan turns off and a/c turns on no fan.Start up capacitors?

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  • davenon Jul 15, 2009

    Model is 59516.601 and is 10 years old.

    Thermostat was already replaced but it's model no. is 3107612.008

  • davenon Jul 15, 2009

    Model is 59516.601 and is 11 years old
    Thermostat is 3107612.008. Already replaced that thinking the sensor was bad. It did run longer, but now after 10 minutes, the unit shuts down and the above mentioned occurs.

  • davenon Jul 16, 2009

    Will get back to you after this weekend
    My camp is 1.5 hours away, but go out.
    Thanks for the info.

  • davenon Jul 20, 2009

    OK,
    Back from another crappy weekend where the A/C still was not needed (good and bad thing here).
    This is what I found.
    No Dirt/debris/wasp nest was detected where you suggested to look

    Early this spring I changed the fan motor as it was making loud vibrations last fall (before it broke down).
    After looking at the schematics, I found that I had made a wiring mistake. The Fan and Compressor start capactor wires were reversed (Fan start going to compressor run cap and vice versa).

    After fixing wire error, I turned on the ac and my circuit breaker blew (Not main circuit, only ac circuit). I reset the circuit breaker and it immediately blew again. I reset it 1 more time and the ac turned on.

    The A/C was working and blew cold air for aprox. 15-20 minutes.

    Then at about 75 degrees (temp was 78 when I turned it on), the unit shut down. AFter 5-10 minutes, the fan turned on without a/c and run 5-10 minutes.
    This happened twice without ac.
    Then ac compressor turned on, but no fan.

    At that point a shut unit down as compressor was running without the fan.

    Additionally, when the compressor turned on the 2nd time, it was very laborious trying to start.

    My thought is that the start and/or run capacitor is leaking and not maintaining a full charge.
    So when I tried to turn on ac tripped breaker. cap got a charge and ac worked. Or possibly the compressor freezing sensor?

    Thought or ideas on this theory?
    Thanks for all your help so far by the way.

  • Mike Butler
    Mike Butler May 11, 2010

    Something doesn't make sense, obviously. Can you get complete model # off upper unit. remove filter cover & look up on bottom of upper unit for complete number. Also, thermostat model please. Age of unit?

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  • Dometic Master
  • 6,674 Answers

If it was start up capacitors, it wouldn't start initially every time. Do me/you, a favor, and remove your filter inside (return air) , and if it's a ducted system, remove entire plastic cover inside. Take a flashlight & look way up where filter covers in hole & take a good look at cooling fins on evaporator (front of AC). Look for restrictions such as dust etc. That dust will turn just like mud on there due to condensation mixing with dust, and block off flow which could cause unit to freeze up & compressor to kick out. If your real ambitious, and find lots of dust there, taking cover off roof unit would be next, and check same there at back end (condenser) coils & cooling fins.Get back to me after inspection from inside. Could still be electrical but lets check that it has proper maintenance & best chance to work properly by doing this first.

Posted on Jul 16, 2009

  • Mike Butler
    Mike Butler Jul 16, 2009

    Forgot to mention, wasps like to make nests under those covers, so a little investigating ( bang on cover, & pay close attention, if you don't see them going in & out when you, or whoever gets up there.) may save a good sting. When/if, you do go up & hit the cover, make sure your between the AC & ladder down. I made the mistake of hitting it one time & heading in opposite direction away from ladder. Pretty big swarm came out, but luckily I got far enough away, until they settled down, then made it to the ladder came back next morning, with spray. Sundown or cloudy day good time to pull cover off. If you do it early in morning just be careful as roof is usually wet & real slippery. Good Luck

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