Adler ice maker shows E18; unit stops and may display a generic sensor fault.

Safety first: Unplug the ice maker before inspecting internal wiring.

• Visual inspection: Check all accessible sensor connectors (evaporator, ambient, bin, water level) for moisture, corrosion, or loose pins.
• Dry and clean: If moisture is present, dry connectors thoroughly and apply a light coating of dielectric grease if recommended by Adler.
• Check harness continuity: Use a multimeter to test continuity of suspect sensor wires from the sensor to the control board.
• Isolate faulty sensor: Disconnect sensors one at a time and power up to see if E18 changes to a more specific code, then replace the identified Adler sensor.
• Replace control board if needed: If all sensors test good and wiring is intact, the main PCB may have a failed input circuit and require replacement.