Safety first: Unplug the appliance before removing any trim or control panels.

Locate ambient/cabinet sensor: On many De Dietrich models, an additional NTC is located near the air intake or behind a small grille in the liner or control housing.
Visual check: Inspect the sensor and its wiring for damage, moisture, or loose connectors. Ensure the sensor is not hanging loose away from its intended mounting point.
Check for pinched wires: Look along the door hinge area and where the harness passes through the cabinet for crushed or cut insulation.
Replace suspect sensor: If the sensor is cracked, corroded, or reading obviously wrong (for users with a multimeter), replace it with an OEM De Dietrich NTC sensor of the same specification.
Reset and test: After reassembly, plug the freezer back in, clear the alarm via the control panel, and monitor temperature stability over 24 hours.

If AL06 persists with a new sensor, the main PCB may be defective and should be evaluated by a technician.

Freezer displays AL06; temperature may be too cold or not cold enough, and readings seem erratic.

Possible Causes