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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.
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Hi, Dehumidifiers freezing up can be causes by a few different problems. Here is a tip that I wrote to help people with the freezing dehumidifier problem....
usually, ice build up is caused by low refrigerant levels (a dehumidifier is essentially an air conditioner). depending on the unityou may or may not be able to service it. Some of these systems are sealed at the factory and a pierce valve is needed to add refrigerant to the system.
Your unit has a sealed system leak. The sealed system is warrantied for five years. Find your receipt and call an authorized LG dealer to initiate an exchange.
freezing up can be causes by a few different problems. 
My unit also ices up...however mine form ice on the back of the unit on an area I would describe as the fins.
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