Question about Dometic Rooftop RV Air Conditioner

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Not cooling Have a Dometic 13500 roof top air cond. We are full timers in our 2004 Open Road 5th wheel. Lately the air will not cool below 81 degrees and it keeps kicking off because the compressor overheats. wait 4 minutes and it comes on again. Air is col but not cold. Have cleaned the coils, etc. Good airflow just not cold air. HELP!!!!

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  • p3phil May 29, 2010

    Thanks for your assessment! The coils are clean and the fan is running. Maybe the unit is just too small for to combat this Florida sun.


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Check the and see if the condenser fan is running. you will find it if you take the top off also check and see if the condenser coil is clean. if it is dirty or the fan under the top is not running it will cause the compressor to short cycle on limits or overload.

Posted on May 29, 2010

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Posted on Jan 02, 2017

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Hi, could be lack of freon, or motor for refrigeration on roof is short cycling(switching of before cooling, but first check freon(gas) in a/c, could also be faulty thermostat, you can bridge thermostat, open thermostat and if there are two wires connect then and see if cooling get colder, if thermostat are heating & cooling, don't bridge wire, you will let me know brand & model number, of thermostat so i can tell you which two wires to connect. but first check freon(gas) in condenser on roof. good look.

Aug 06, 2009 | Heating & Cooling

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