Safety first: Unplug the dehumidifier.

Check tank position: Remove and reinstall the water tank, ensuring it is fully seated and level.
Inspect tank tab: Verify that the plastic tab or magnet on the tank that triggers the switch is intact. Replace the tank if broken.
Test switch: Access the tank full switch and test with a multimeter while actuating it. Replace if it does not change state.
Inspect wiring: Look for shorts or damaged insulation on the switch leads and repair as needed.

Display shows E2; unit may shut down unexpectedly.

Possible Causes