Dehumidifier displays F0 and does not dehumidify; fan may still run.

Safety: Unplug the unit. Do not attempt to open or recharge the sealed refrigeration system without proper certification.

Steps:

• Basic checks: Ensure the room temperature is above the minimum operating temperature. Very low ambient temperatures can cause low-pressure conditions.
• Coil inspection: Remove the front cover and observe the evaporator coil while the unit runs (if it will run). If only a small section frosts or there is no cooling at all, refrigerant issues are likely.
• Sensor wiring: Locate the low-pressure sensor or switch (usually on the refrigerant line near the compressor). Check wiring and connectors for damage or corrosion.
• Professional diagnosis: If wiring is intact, a certified HVAC technician should check system pressures, locate leaks, and recharge or repair the system as needed.
• Control board: If pressures are normal but F0 persists, the main control board or pressure sensor may need replacement.