Freezer compartment not reaching set temperature; E2 error displayed; temperature alarm may be active.

Safety first: Disconnect the appliance from mains power before removing panels or working near wiring.

Diagnostic steps:

• 1. Confirm airflow and frost: Open the freezer and check for heavy frost build-up around the rear panel. Excessive ice can affect sensor readings; if present, defrost the unit fully (24 hours unplugged with doors open, towels in place) and see if E2 clears.
• 2. Locate the freezer NTC sensor: Typically mounted behind the rear freezer panel or clipped to the evaporator tubing. Remove drawers and the rear inner panel (usually held by screws) to access.
• 3. Visual inspection: Look for damaged wires, ice-encrusted sensor, or corroded connectors. Carefully thaw any ice with warm (not hot) air; do not use sharp tools.
• 4. Measure sensor resistance: With the unit unplugged, disconnect the sensor and measure resistance. At freezer temperature (~-18 °C), NTC values are higher than at room temperature (often 20–40 kΩ; check model spec). An open or shorted reading indicates a bad sensor.
• 5. Check harness continuity: If the sensor is within spec, test continuity from the sensor connector to the main PCB. Repair any broken or pinched wires, especially where they pass through cabinet walls.
• 6. Replace faulty components: Install a new Siemens-compatible freezer NTC sensor if defective. If sensor and wiring are good but E2 persists, the main control board may need replacement.

Note: Accessing the evaporator area involves removing panels and can expose sharp metal edges; wear cut-resistant gloves.