The icing is generally caused but 4 basic things:
1. The air intake filter is very dirty or clogged and needs to be removed and cleaned.
2. There is not enough clear air space surrounding the unit. You need to maintain 12" to 18" around
the entire unit.
3. The cooling coils are dirty and need to be cleaned. This can be accomplished using a sponge
dipped in warm water mixed with a mild dish washing liquid, rinsed, wiped dry and the applying
a light coating of WD40.
4. The dehumidifier is being used in a basement, where the air temperature at floor level is colder
than at shoulder level. Dehumidifiers struggle to work at temps below 65 degrees F. Raising the
unit up off the floor, onto a sturdy table or counter top will generally solve the problem. It must be
sturdy enough to handle the weight of the unit, plus a full tank of water.
A less common problem is a small leak in the cooling coils. Which allows the refrigerant gas to escape and frost the coils.
Hope this helps you to further troubleshoot & solve the problem. Thanks for choosing FixYa.
So I just had this happen with my Frigidaire fad704dwd dehumidifier. I went to basement and heard it running and sounded off. The compressor was running fan was off which is bad and humidity said 30. I then pushed the off button and it stayed running. I was able to fix it. To make long story short it was a bad ground. I took the plastic back, sides, and front off. There was a green ground (main ground) and Green/yellow ground (fan ground) on the front coil with a bunch of rust. Removed the grounds connected them both together and cleaned the surface area and used a new stainless screw nut and screw to remount the wires to evaporator coil. Everything started working fine after that and I put it back together. Good Luck
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