Dehumidifier shows 'DEF' and compressor cycles off frequently

Note: 'DEF' usually indicates normal automatic defrost operation, not a fault, unless it stays on continuously.

User checks:

• Check room temperature: If the room is below about 10–12 °C, move the unit to a warmer area. Dehumidifiers are less effective in cold rooms and will defrost more often.
• Clean filter and grilles: Ensure the air filter and intake/exhaust grilles are clean to maintain airflow.
• Allow time: Let the unit run for 30–60 minutes. 'DEF' should clear once the coil is defrosted.

If 'DEF' never clears:

• The evaporator temperature sensor may be faulty or mispositioned. Inspect and re-clip it to the coil, or replace it if defective (see E3 entry).
• If the sensor is good, the main control board may be mismanaging defrost and may need replacement by a technician.