There are two major causes of a dehumidifier or air conditioner to freeze up the evaporator coil. First is lack of air flow try cleaning or replacing the air filter if it has one; make sure the fan is running and the coils are clean. Second is a low charge of refrigerant in which case it may be cheaper to replace the unit than have a certified repair person fix it. Make sure to recycle the old unit if you replace it.
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There are two major causes of a dehumidifier or air conditioner to freeze up the evaporator coil. First is lack of air flow try cleaning or replacing the air filter if it has one; make sure the fan is running and the coils are clean. Second is a low charge of refrigerant in which case it may be cheaper to replace the unit than have a certified repair person fix it. Make sure to recycle the old unit if you replace it.