Dehumidifier shows E3 and stops dehumidifying; fan may still run intermittently.

Safety: Unplug the unit before removing the front panel or control panel.

• Soft reset: Disconnect power for 5–10 minutes, then reconnect. If E3 reappears, the humidity sensor circuit is likely at fault.
• Locate humidity sensor: Remove the front grille and air filter. On many Comfee units, the humidity sensor is a small module near the air intake or behind the control panel, with a small vented plastic housing and a 2–4 wire harness.
• Clean sensor area: Use compressed air or a soft brush to remove dust and lint from the sensor vents. Do not spray liquids directly on the sensor.
• Check wiring: Inspect the harness for damage and ensure the connector is fully seated on the main PCB. Reseat the connector.
• Replace sensor module: If E3 persists, replace the Comfee humidity sensor module with the correct part for your model. Mount it in the same orientation so it is exposed to room air, not coil air.
• Board replacement: If a new sensor does not resolve E3, the main control board's sensor input is likely defective and the PCB should be replaced.