Question about Dometic Rooftop RV Air Conditioner

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Dometic Quick Cool RV unit

Hi there!
My unit freezes up after a while then no cool.
I remove the inlet louver and can see ice on the evaporator.
Thanks
Mark

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Time to be serviced,could be a small leak and loosing freon, or low air flow due to dirty filter.,

Posted on Sep 07, 2008

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Why is my brisk air duo therm rv ac freezing up on the inside.


Where you see frost all the time, wait for unit to thaw and start cooling again and carefully slide hand up in that hole and see if you can feel cool air leaking in from divider that separates cool and return air, that will cause freeze-ups as well. Use foil tape if necessary to stop any cool air coming in to return air from around divider. Also, if you have any diffusers closed, (on ducted system in ceiling) or partially closed, open them all up full flow. If you restrict the cold air from coming out too much, it can also cause freeze up. One more thing, take cover off where cool air box is and double check that something isn't restricting the flow of cold in to the duct work if it has ducted system.

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1 Answer

I have a trailer with a duo therm ac..the outside fan is coming on but nothing is blowing thru the registars


Not sure where your located, so check that unit didn't freeze up on you. Make sure evaporator and condenser coils/fins are clean and run on fan only to aid in thawing them out. Once you see condensation running off roof good, try using cool again and see what happens. When they freeze up, airflow gets restricted through unit. The outside fan and blower wheel for forced air inside are attached to same motor, so if fan is working, blower wheel should be turning as well unless it is broken, or allen key has come loose on clamp around center of blower wheel. Other possibility is that the blower wheel is turning but forced air ducts have blockage at inlet, which will require letting ceiling assembly down to inspect, or removing cover on roof and screws at front evaporator and opening it up. Make sure power is off during inspection.

Sep 12, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Unit works fine when first turned on then the CFM coming out of ceiling ducts decreases significantly and the unit stops cooling well. I have a suspicion that it is freezing up?? This Quick Cool unit...


Examine the side of the evaporator coil that the dust hits 1st, in other words the intake side.
Even with a filter in place, they get a lot of dust anyways and must be chemically cleaned,at least brushed off if possible for now. Dont mash the stuff into the coils though, this is why chemical coil cleaners that are acidic and will go from liquid then expand into a foam are used. They push the debris out and strip the coils sparkling new! Otherwise you are low on refrigerant.

Sep 11, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Dometic P/N Duo-Therm Model #59516-531 that started running more and more to cool my RV 5th wheel. I checked filter, drain, and noticed the unit was icing up. I turned off AC and let fan run to...


It is probably low on refrigerant. You can only check this if you have a set of gauges. Otherwise, take it to an air cond company and they will check it for you.

Jul 21, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Unit cools great but when extremly hot weather occurs it eventually freezes up.


dirty filters in the indoor unit.As the ambient temperature rises the unit will work harder and longer,its fine when its just a normal day because the evaporator coil wont have time to ice up as the compressor will cycle off before the coil freezes totally,but during extreme ambient temperatures the coil will ice up as the compressor will continue running to reach set-point causing the coil to ice up

Jan 02, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Have a Quick Cool RV roof unit compressor:


Try ( www.dometicusa.com) site and they have dealer locator on there site for wherever you are.

May 17, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

15000btu roof top unit freezing up


take a garden hose to the evaperator,probably dirty.

Sep 07, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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sounds unit is freezing up take down the filter and lokk for ice on coils if so possible low gas but just cause it dont cool do not assume it is low on gas

Jul 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Dometic Quick Cool compressor freezing and evaporator coil


Could be low. First check air filter, air flow, and evap coil to see if it has restricted airflow. If all seems well, its probably low. The specs will tell you what type and how much refigerant. To access system, you will need a gauge/manifold set, refrigerant, and a piercing or line tap valve for the low pressure side of the system. Of course, first, you need to locate and repair the refrigerant leak.

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you need to check that the breaker it rated high enough for the ac unit

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