John,
I have had mostly good luck with my Dometic A/Cs, though there have been occasional instances of icing up. There are many thoughts how to prevent this from occuring, but why don't you contact the experts themselves? It can't hurt.
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For (Dometic) RV products
Customer Support Center
Phone: 1-800-544-4881
[email protected]
Dometic
P.O. Box 490
Elkhart, IN 46515
Sales and Marketing
2320 Industrial Parkway
Elkhart, IN 46516
Phone: 574-294-2511
Fax: 574-293-9686
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When I do get a freeze-up, I turn the temperature setting warmer (or the A/C off). Keep the fan on continuously (rather than cycling) by setting it to "manual" to help melt the ice faster & dry the coils. I have the feeling this mostly occures during very humid conditions.