Diagnosis
This usually points to an internal fuse blowing, often from a power surge or a compressor startup issue. It's a common failure point on many dehumidifiers.
How to Fix It
You'll need to access the internal control board. 1) Unplug the unit. 2) Remove all the screws from the back panel. You might also need to remove the bucket and take out a few screws hidden around the top and sides. 3) Carefully remove the rear cover. 4) Locate the control board. On this model, look for a small, clear cylindrical fuse holder soldered to the board. It often contains a 3 amp or 5 amp fuse. 5) Use a multimeter to test the fuse for continuity, or visually inspect it for a broken wire inside. 6) If blown, you must replace it with an identical fuse (same amperage and physical size).
If That Didn't Work
Before reassembling, check all the wire connections on the control board are snug. Also, ensure the unit is plugged into a working outlet by testing it with another device. A tripped GFCI outlet in a basement or garage is a frequent culprit.
Heads Up
This involves opening the unit. If you're not comfortable with basic electronics and safe disassembly, it's time to call a repair tech. Also, a blown fuse can be a symptom of a bigger problem with the compressor, so if the new fuse blows immediately, stop.