Coils freezing up
Its likely one of two things. 1) the fan isn't moving enough air through the unit. If there is a filter, clean it. 2)If aire flow is OK and its freezing up on one end of the coil and the other end of the coil is not very cold at all then refrigerant charge is probably low. I know that seems counter intuitive but a low charge in a refrigerator or A/C unit (which this dehumidifier is a derivative of) can actually frost up when slightly under charged. Now if the charge is determined to be low there is a leak somewhere and that leak will need to be found and repaired. It will probably take an electronic leak detector to find it. If the leak is on a section of aluminum tubing in a tight location it may be impossible to repair the leak and that may force you into a new unit. If its on a copper tube it can be fixed. If its on aluminum tubing it can be clamped shut if there is physical access for attaching a clamp and seal. Sometimes a leak pushes out some refrigerant oil at the site of the leak making it a visible spot to the naked eye. Hope these comments are of some help
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