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Icing is normally caused by lack of air flow. Check the air filter and cleanliness of the coil. Look for obstructions in the fans path and even a dirty fan blade.
The gas can pass through the pipework slowly by osmosis especially after several years use. However, check fans, heat exchangers etc first before condemning unit.
When mine iced over, i took it apart and sprayed all the inside with a hose. Then I put a fan on it for a few day.( make sure the electrical is dry). Got all the dust and dirt out. Re- assembled and works great now
typically happens when there is a lot of dust in air. Try cleaning it VERY well, which would mean, shutting it for a few days, letting it melt and dry off, then not only vacuuming it, but then take an air gun (or Air in a can) and get the dust off the coils. Obviously if there is a filter clean it, or replace it.
Check for bent fins on the coil. Most of the newer ones (and yours should as well) have an auto defrost to help with that.
Good luck
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