I also have model LHD45EL and it is about 3 years old. The humidity setting won't go lower than 70%...
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I also have model LHD45EL and it is about 3 years old. The humidity setting won't go lower than 70% and I have been getting icing on the top of the cabinet. I just tried cleaning the filter (OK, I hadn't done that in 3 years and it was filthy) and I set it for 2 hours on/2 hours off operation on low fan speed. Let's see what happens.