Question about Dometic Rooftop RV Air Conditioner

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Dometic a/c on fifth wheel with comfort controls

Unit can't keep up when outside temp gets over 80 degrees. The unit then starts to go off and on every 3 or 4 minutes. Also in the furnace mode, the furnace warms the coach 2 or 3 degrees then turns off for a few minutes and starts again. Campers World says a/c unit is operating to all Dometic specs.

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First lets address the heating issue. These are not furnaces but are known as "Chill Chasers" and are not designed to "heat" your RV Attempting to use them as a whole coach heater will burn them up in short order.

Your A/C sounds like the coils are freezing up. There is a small probe that is placed into the coils. you can see it from under the unit if you remove the interior cover - a little 1/8" in dia. silver piece flattened on one end to slide between the coil fins with a wire going back to the control box
It may have fallen out

Posted on Mar 08, 2010

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