E09 displayed, ice maker stops and bin is full of ice

Safety first: Unplug the unit before working near sensors or wiring.

Sensor checks:

• Empty the bin: Remove all ice from the storage bin and wipe it dry.
• Locate bin full sensor: Many De Dietrich models use an infrared beam sensor or mechanical bin switch near the top of the bin. Clean the sensor lenses with a soft, dry cloth.
• Check alignment: Ensure the emitter and receiver are directly facing each other and not bent out of position.
• Test mechanical switch: If a lever-type switch is used, press it by hand and listen for a click. Test continuity with a multimeter; it should change state when pressed.
• Inspect harness: Follow the sensor wiring back to the control board. Reseat connectors and look for pinched or broken wires.

Note: If the sensor and wiring are intact but the error persists, the main control board may be misreading the sensor signal and require replacement.