Any icing-up or 'freezing" or "spitting ice chunks" is a malfunction and just means the unit needs servicing. Usually the factors are low freon or dirty filters (Not enough air movement) I forgot what my service guy said but it was common sense stuff like never run the A/C when the outside air temperature was below 40 degree's or something like that... Other than that there is a service issue. Clean/vacuum the unit thoroughly in every crack, crevice, nook or cranny and replace the filter with the factory recommended replacement or equivelent and then try again.
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