Ice maker reports a temperature sensor error, unit may shut down or produce very small/large cubes

Safety first: Disconnect power before accessing internal wiring or control boards.

Steps to check:

• Locate sensors: Grundig ice makers typically use a thermistor clipped to the evaporator plate and another in the cabinet air stream. Refer to the service diagram if available.
• Inspect wiring: Check the sensor leads for cuts, pinches, or signs of moisture ingress. Ensure connectors are fully seated on the main control board.
• Measure resistance: With the unit unplugged, disconnect the suspect thermistor and measure its resistance at room temperature. Compare to Grundig's specification (commonly 5–10 kΩ at 25°C). An open or near-zero reading indicates a bad sensor.
• Replace faulty sensor: If readings are out of range, replace the thermistor with a compatible Grundig part. Clip or mount it in the same position to ensure accurate sensing.

Tip: After replacement, clear any stored error by unplugging the unit for several minutes before restarting.