Dehumidifier runs briefly then stops with E3 error on the screen

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

• Locate humidity sensor: On many Inventor dehumidifiers, the humidity sensor is mounted behind the front grille near the air intake or integrated into the control panel area. It is usually a small plastic module with a 3–5 wire connector.
• Visual inspection: Check for obvious damage, corrosion, or broken wires. Ensure the connector is fully seated on the PCB.
• Clean the sensor area: If the sensor is covered in dust or lint, gently clean around it with a soft brush or compressed air. Do not soak it with liquid cleaners.
• Check harness continuity (advanced): Use a multimeter to verify continuity of the harness from the sensor to the PCB if accessible.
• Replace humidity sensor module: If E3 persists, replace the Inventor humidity sensor module with the correct part number for your model. Mount it in the same location and reconnect the harness.
• PCB replacement: If a new sensor does not clear the error, the main PCB may be faulty and should be replaced by a professional.