Safety: Unplug the unit before opening. Mains voltage and charged capacitors can be dangerous.

Steps:

Check outlet: Test the wall socket with another appliance. Verify any power strip is switched on.
Inspect power cord: Look for cuts, kinks, or burn marks. Replace the cord set if damaged.
Check main switch: Ensure the power button or rocker switch is not physically broken. Test continuity across the switch when turned on.
Internal fuse: Access the main PCB and locate the fuse (often a glass or ceramic fuse near the AC input). Test with a multimeter and replace with the same rating if blown. Investigate for short circuits before replacing.
SMPS check: If the fuse is good but no low-voltage output is present, the switching power supply section of the PCB may be defective and the entire board should be replaced.

Warning: If the new fuse blows immediately, stop and seek professional service; there is likely a serious short.

Dehumidifier does not power on at all; no lights or display

Possible Causes