Question about Dometic Rooftop RV Air Conditioner

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Freezing rooftop a/c

My rv rooftop a/c freezes up especially at night,but now it started doing it during the daytime,and its 90 degrees outside.

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  • panilling9
    panilling9 May 11, 2010

    is your filter clean,?

    is your evaporator coil clean?

    does your airflow seem normal?

    you may be low on refrigerant?

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  • 29 Answers

My home unit was doing that because it was low in freon and needed charged.

Posted on Jun 15, 2009

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Clean the coil inside and outside. try putting it in a window on a shady side of the house. I worked on a outside unit wher it was 90degrees outside but 107 degrees where it was in a hot location, close to road on sunny side of house.

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sounds like you don't have enough of a charge in the system of "free-on". that would make the a/c cycle and cycle to try and keep the pressure up and would also contribute to the lines frosting and freezing

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That's right. There is no defrost cycle on a rooftop unit as they are so basic. They need a defrost regularly, especially when it's warm. Check the outside unit is clean and air gets through the vents ok.

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Do you have good airflow out of the inside vents? Does it run fine in the daytime then you go to bed and it's frozen in the morning? Let me know what it's doing and i'll try to pinpoint what your dealing with.

Sep 28, 2010 | Dometic Rooftop RV Air Conditioner

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Hi; I hope You called a company that will honor any warranty on the heatpump. Sounds to Me like I would contact the original installer for more help or free replacement.Also at 55 or 75 degrees outside The heatpump should be providing toasty air. Only at close to freezing temps will You get a reduction in warm air and then the heat strips will help out then also check to see if the unit has outside air dampers and make sure they are closed..alpharome416

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1 Answer

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units are not able to work properly above 90, 1.0 T not go for more than 1 room. is outside of unit clean? if not turn off power to unit then spray 409 or simple green or something along those lines of cleaners on the coil part (soak it real good) it should cover entire coil as much as possible. let cleaner sit on it for about 10 minutes then use water hose to rinse as good as you can. wait about 10 minutes then try unit - so work better.

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1 Answer

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Possible low voltage condition would cause that kind of a problem. To small a cord without the ability to carry and maintain the voltage would cause a voltage drop. I would test the voltage supply and make sure it is within 10% of that required for your A/C to operate properly.

Jun 15, 2008 | Heating & Cooling

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