Display shows AL03; freezer may run continuously or not at all, and temperature is unstable.

Safety first: Unplug the freezer before removing internal panels or working near the evaporator.

• Access evaporator area: Remove baskets and the rear inner panel of the freezer compartment to expose the evaporator coil. Use a hair dryer on low only if necessary to soften ice; do not overheat or puncture tubing.
• Locate defrost sensor: The Ignis evaporator sensor is usually clipped to the evaporator tubing or attached with a metal clip or tape. Check that it is firmly attached and not dangling.
• Inspect for damage: Look for cracked sensor casing, corroded connectors, or damaged wires. If the sensor is iced over excessively, allow it to thaw completely.
• Test sensor: Disconnect the sensor and measure resistance with a multimeter. Compare to Ignis specifications for the current temperature. Replace if open, shorted, or far out of range.
• Reattach or replace: If the sensor has come loose, reclip it securely to the evaporator. If faulty, install a new evaporator defrost NTC sensor and route wiring as originally installed.

If AL03 remains after sensor replacement, the main control board may have a defective defrost circuit and should be evaluated by a professional.