LG dehumidifiers freezing on top of cabinet

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Moderator Post (s) for this thread: > "frosting" ON cabinet? by DanO on 05/10/2008

I have 2 dehumidifiers that I have set on 40%. I run a fan in the basement all the time, and I keep the temp. around 65 deg. F.

After working well for 3 or 4 years, both started freezing up this winter/spring. Ice builds up on top of the cabinets. They are enclosed entirely by their cabinets. No coils are exposed.

Does this indicate they need to be replaced, or is there a work around for this problem.

The basement was very dry this winter, and I hardly needed to empty them at all.

Any ideas?