RV Repair: duo-therm r/v a/c, duo therm, freon

Question
The "A" coil on my unit is freezing up. What can I check to see what the problem may be. I've cleaned the filter and coil is not dirty. Thanks
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Answer
There are 2 things that will cause a roof A/C to freeze

low on freon, and low on air flow.  If your filter is clean, that's a good thing.  You can't run the unit on low fan on cool so if you were that could be the problem.  If you had it on high fan, you should have the freon level checked and the unit checked for leaks.

Garry