Refrigerator compartment temperature too high; display shows E1 and may beep intermittently.

Safety first: Unplug the Hansa refrigerator from the mains before removing any panels or handling wiring. Do not work on live circuits.

Step-by-step checks:

• 1. Power reset: Unplug the fridge for 5–10 minutes, then plug it back in. If E1 returns after a few minutes of operation, continue with diagnostics.
• 2. Locate the refrigerator NTC sensor: On most Hansa refrigerators, the fresh-food (refrigerator) temperature sensor is behind a small plastic cover on the rear interior wall or near the air outlet from the evaporator cover. Remove shelves as needed and gently unclip the cover.
• 3. Inspect the sensor and wiring: Look for broken insulation, pulled wires, or signs of moisture ingress at the sensor connector. Reseat the connector firmly.
• 4. Test the sensor with a multimeter: Disconnect the NTC sensor from the harness. Measure resistance at room temperature (around 20–25°C). Typical NTC values are in the 5–20 kΩ range (consult the Hansa service sheet if available). If the reading is infinite (open) or near 0 Ω (short), the sensor is defective.
• 5. Check continuity to the main board: If the sensor tests OK, check continuity of the two sensor wires from the sensor connector to the main control board (usually located at the rear, behind a metal or plastic cover). Repair any damaged or pinched wires.
• 6. Replace faulty parts: If the sensor is out of spec, replace the refrigerator compartment NTC temperature sensor. If wiring and sensor are good but E1 persists, the main control board may have a failed input and should be replaced by a qualified technician.

When to call a professional: If you are not comfortable using a multimeter or accessing the main control board, contact an authorized Hansa service center.