De'Longhi dehumidifier displays E1 and will not start dehumidifying.

Safety first: Unplug the unit before removing any covers. Avoid touching live terminals.

Step-by-step:

• 1. Power cycle: Unplug the dehumidifier for 5 minutes, then plug it back in. If E1 clears temporarily but returns, proceed to inspection.
• 2. Access control panel: Remove the top or rear cover (depending on model) by taking out the screws. Carefully lift the panel to expose the control board.
• 3. Locate the room temperature sensor: Look for a small two-wire harness leading to a probe clipped near the air intake or evaporator coil. On De'Longhi units this is typically an NTC thermistor.
• 4. Check connections: Ensure the sensor plug is firmly seated on the PCB. Reseat the connector by unplugging and plugging it back in.
• 5. Inspect wiring: Look for pinched, cut, or corroded wires along the harness. Repair any obvious damage with proper connectors and insulation.
• 6. Replace the sensor if needed: If the wiring is intact but E1 persists, replace the room temperature sensor with a compatible De'Longhi NTC probe. Route the new sensor in the same position and secure it with the original clip.
• 7. Suspect PCB: If a new sensor does not resolve E1, the main control board may be defective and should be replaced by a technician.