Question about Dometic Rooftop RV Air Conditioner

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Constant cycling My RV air conditioner cools then shuts off. In less than a minute it starts again, runs for a minute, shuts down and repeats this until it gets on your nerves. Doesn't seem normal. What's up?

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  • Chas T Apr 05, 2008

    Not using an inverter. Only circuit protection is a surge protector which is plugged in to the electric pedestal outside.

  • Chas T Apr 05, 2008

    Doesn't sound right. The unit will run continuously until it cools the room. Then it shuts down, is down for a very short time when it starts up again. It will run for a very short time with compressor and fan cooling the room. It runs for a very short time (one minute or less) when it shuts off again and the cycle continues in this fashion until I either push the thermostat down to keep it running or push it up to make it stop.

  • Chas T Apr 06, 2008

    "Enery Saver Mode"? This is a new one to me. What is this and how do I change or re-set it to the "working mode"? Thanks

  • Chas T Apr 07, 2008

    User manual does not have anything that refers to modes. The only setting that will shut off the unit after is cools is the "auto fan" setting. The fan can be set so that it shuts off after cooling or continues to run after reaching the set temperature. Having the unit set on auto fan is when the constant cycling problem occurs.

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Do you use a inverter.. or any protection circuit>
if so remove it and connect it directly

Posted on Apr 05, 2008

  • 2 more comments 
  • dewan nafees ahmed Apr 05, 2008

    ok then problem is in your circuit board alone. all other components are very fine.

    it tries to start every time and then shuts off itself right?

    then wen it start s trying it shuts off due to some short in circuit.
    this can be looked manually or can be checked with a meter.

    this can be done manually by you if you are pretty handy in electronics.

    else best way is to call a tech to clear this problem.

  • dewan nafees ahmed Apr 06, 2008

    hey hello,

    yeah now the problem is explain in detailed.

    thanks for replying.

    your machine is working in "ENERGY SAVER MODE"

    this is the whole thing behind the problem.

    just change the working mode. keep it in cool always.

    that is the best.

  • dewan nafees ahmed Apr 07, 2008

    i think all the units like that will be having different modes of working.



    there wil be normally modes like warm, cool, enegry saver, and many other modes.



    in energy saver mode only unit will shut down itself once the room gets cooled.



    for the modes and how to change them you must refer to your user maual.


  • dewan nafees ahmed Apr 07, 2008

    then why not you remove it from auto fan mode?

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1 Answer

At night its shuts down when the therm is satisfied,but trys to restart right away and when it does start it shuts down right away and just keeps doing this


The thermostat has a differential built into the temperature sensing operation. The differential is normally a degree or more. If the stat shuts down at 72 degrees it should not start the unit again until the temperature in the room reaches 73. If the AC runs and cools properly until it shuts down, I would check the thermostat. The AC can not restart immediately after it shuts off because the pressures in the system are too high at the compressor. It takes a few minutes for the pressures equalize allowing the compressor to start. If the stat tells the unit to start under high pressure, the compressor will shut down on overload. It will start and run after the pressure falls enough for the compressor motor to run.

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1 Answer

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This is called short cycling. It sounds like the compressor is getting hot and opening a bi-metal overload, which shuts the compressor off. The compressor cools, because it is not running and the bi-metal contacts close allowing the compressor to start again. This will repeat itself and is usually due to low refrigerant, which usually means there is a leak in the normally sealed refrigerant lines. The refrigerant cools the compressor windings and if it is low it cannot do that, hence the shutting off of teh compressor, cooling down process and restarting of your compressor. Short cycling will ultimately ruin the compressor.

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1 Answer

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1 Answer

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