De'Longhi dehumidifier displays P2 and stops; main water tank is full.

Safety first: Unplug the unit before removing the water tank to avoid spills near live parts.

Step-by-step:

• 1. Empty the tank: Slide out the water tank carefully and empty it completely. Rinse with warm water to remove any sludge.
• 2. Clean float mechanism: Inside the tank, locate the float that triggers the full sensor. Ensure it moves freely and is not stuck by mineral deposits. Clean with a soft brush if needed.
• 3. Inspect tank seating: Reinsert the tank firmly until it clicks into place. Make sure it is not crooked and that the front panel closes fully.
• 4. Check tank switch: With the unit unplugged and tank removed, locate the tank full micro-switch inside the cabinet. Press it by hand to confirm it moves freely. Clean any dust or debris.
• 5. Test operation: Plug the unit back in with the empty tank installed. If P2 clears, monitor until the tank fills again to ensure proper shutoff.
• 6. Replace faulty parts: If P2 remains even with an empty, correctly seated tank, replace the tank float assembly or the tank full micro-switch.