Display shows E2 and the refrigerator cycles erratically; interior temperature fluctuates widely.

Safety first: Unplug the appliance before removing the control panel or display housing.

Steps:

• 1. Locate the ambient sensor: On many De Dietrich refrigerators, the ambient NTC is located behind the front display/control panel or in a small grille on the cabinet front/top.
• 2. Remove the control panel: Carefully pry off trim pieces and remove screws to access the display PCB. Avoid pulling on the wiring harness.
• 3. Inspect the sensor and wiring: Look for discoloration, broken wires, or moisture damage. Reseat the connector firmly on the PCB.
• 4. Test the sensor: Disconnect the NTC and measure resistance at room temperature (~20–25°C). Compare to expected NTC values (often 4–6 kΩ). Replace the sensor if readings are open, shorted, or far off spec.
• 5. Check PCB tracks and solder joints: Examine the display/control PCB for burnt components or cracked solder joints at the sensor connector. Reflow solder only if you are experienced; otherwise replace the board.
• 6. Reassemble and test: Refit the panel, restore power, and monitor operation. If E2 persists with a known-good sensor, the main PCB or display PCB likely needs replacement.