Dehumidifier shows E7 and stops operation, often related to water tank

Safety: Unplug the unit before removing the water tank.

• Empty and clean tank: Remove the water collection tank, empty it completely, and wash with warm soapy water. Rinse and dry.
• Check float movement: Inside the tank or tank housing, locate the plastic float. Ensure it moves freely up and down. Remove any scale, slime, or debris that may cause sticking.
• Inspect float switch: Some AEG models use a magnetic float and a reed switch in the body. Check that the reed switch housing is secure and not damaged.
• Check wiring: Follow the wires from the float switch to the main PCB. Ensure connectors are firmly seated and not corroded.
• Test switch: With a multimeter, test continuity of the float switch while moving the float between empty and full positions. Replace the water level float switch if it does not change state.
• Reinstall tank correctly: Make sure the tank is fully inserted and seated; many models have a tank-present micro switch that must be engaged.