Dehumidifier displays F0 and will not start or behaves erratically.

Safety first: Disconnect power before opening the unit.

Steps to address F0:

• Reset the unit: Unplug for 10–15 minutes, then plug back in and attempt to start. Sometimes F0 is a transient error.
• Inspect all sensors: Check ambient temperature sensor, evaporator sensor, and humidity sensor connections at the main board. Reseat each connector firmly.
• Look for moisture damage: Examine the control board and sensor connectors for signs of condensation, rust, or white corrosion. Dry the area thoroughly and clean light corrosion with contact cleaner.
• Check wiring harness: Follow the main harness for pinched or broken wires, especially where it passes through metal bulkheads.
• Replace main control board: If all sensors test good and F0 persists, the main PCB may be defective and should be replaced.

Warning: If the unit has suffered water intrusion (flooding, heavy condensation), have it inspected by a professional to ensure it is safe to operate.