Question about Dometic Rooftop RV Air Conditioner

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Roof air unit too loud inside; quiet outside.

We have had our Rockwood Windjammer for 1 year now. It has a 13,500 roof air Dometic DuoTherm. We have noticed that the operation inside is very loud. Our Mallard did not make half the noise & was same size unit. What would be causing this too be so loud? Have to talk very loud while it is running.

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When you say loud, do you mean as in airflow noise, or vibration like noise? I take it this is a ducted system as well. Does it have quik cool option on ceiling assy.?

Posted on Jul 28, 2009

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Ice on the coil is caused by 3 things; 1, low freon charge. 2, inadequate air flow across the coil, this can be a filter or dirty coil (I think you addressed these) or the fan isn't blowing enough air over the coil. 3, the unit is running continuously. A heat pump has another cause, that is something defective in the defrost system, like the sensor, reversing valve, control board or relay. If the breaker is tripping its because the compressor is over amping. There can be an obstruction blocking the fan or something like #2. Or the compressor is going out. If the breaker doesn't trip on other settings, like cool, but trips on heat, then I would look at the airflow.

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