Had the same issue, but cleaning has not helped. The filter was clean, I vacuumed the fins/coils; however, I did notice rust and rust pieces in the collecting tray. One side of the fins was slightly rusted. The unit still frost ups when the condenser comes on, but it melts if I turn off then on again as the fan starts first. There is a low temp device but it may not be working properly?
Might it be that the unit simply needs a full thorough cleaning including the tiny spaces between fins? Dust can gather and block air passage on many of the components of a dehumidifier not only on the filter. in some extreme cases, the unit could be undercharged (insufficient) coolant. A service shop engaged in the business of cleaning and repairing air conditioners should also be able to work on your unit.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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