Question about Dometic Rooftop RV Air Conditioner

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Roof ac runs for six minutes then breaks the circuit breakers

Every time we have tried to use our new Dometic roof a/c when it is hot outside it runs for a few minutes then the circuit breakers switch off. We have had it tested three times and it runs, but each time it has been tested it is no more than about sixty degrees outside. Our air conditioner works when it is not needed but does not work when we need it.

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Your problem may or may not be tied to the ac unit its self. 
You did not state how old it is or at least how old you think it is. This would help eliominate some assumptions on my part. I assume from the pic with it and from what i know about RTU on motor homes or travel trailers this is what you have. In anyh case most of the items Im outlining here under the UNit apply to other AC's as well. You also didnt mention what kind of outdoor temps or parking conditions or where you may have been taking the RV. Dirt in the outdoor coil is the most likely problem, from your discription. Take a water hose with a nozzel and good water pressure and flush wash the outdoor coil. If you get mud dirt out with this retry the unit after  lettting it air dry for 30 min to an hour depending on humidity and temperature.

If the ac is the real problem begin by inspecting the out door coil. Usually air is "sucked in" and blown out over the fan motor and compressor, . If the coil is clean (and you can see light thrugh it by looking streight throgh it, being horizontal) then it still may be inside the ac unit. A run capicator or possibly (though I doubt it) low on refrigerant, or a start component if so equiped (not seen on most smaller ac units unless added after the sale and installation). .1 other thing it might be is a loose fan blade but usually this makes so much noise you hear the problem and know right where to look.
If your unit is installed on a travel trailer or other mobile recreation vehc. I suspect it may be wired other than directly or have a bad breaker or a weak connection in the wiring or on the breaker or unit itsself. An ampmeeter would be of help to you in comming to a more accurate diagnosis. About the only way to check without one (and it may not be complete or show anything directly) is to begin at the breaker and feel the surface of it while the AC is running and under a load (like when you have had it trip out before) note the FEEL temp it should not be HOT and not go past where the touch on the front surface is uncomfortable. If it gets HOT , be extreamly careful and disconnect the power and remover the pannel and inspect the breaker. If the wire is tight and is not corroded check the nutural side if its 115V and make sure the wire there is tight. Now If you see any thing that dosnt look right ask somemore questions if you dont feel hot breaker, see any wires loose or corroded, go to the unit on top and inspect the  "TIE BOX" where the wireing attaches to the unit. Again looking for the same thing. With the top off while inspecting move the fan blade aroiund and hold the shaft on the motor if it slips the problem is on the fan blade most likely. Its not suppose to slip.  To my knowledge the power may also come from a generator connection and this needs to be checked too. Get back to me if any of this is not clear 

Posted on Feb 28, 2009


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