Display shows E2 and the unit may overcool or not cool at all; compressor cycling is irregular.

Warning: Disconnect power before accessing internal components. Edges of metal panels and evaporator fins can be sharp; wear cut-resistant gloves.

E2 on De Dietrich wine coolers typically points to the evaporator temperature probe used for defrost and compressor control.

• Locate the evaporator: Remove the internal rear liner panel inside the cabinet (usually held by screws) to expose the evaporator coil.
• Find the sensor: The evaporator NTC is usually clipped to the evaporator tubing or embedded in a small well on the coil, with wires leading to the cabinet wall.
• Check for ice buildup: If the coil is heavily iced, carefully defrost with the unit unplugged. Do not use sharp tools; use warm air or allow time to melt.
• Inspect the sensor and wiring: Look for cracked insulation, corrosion at the clip, or broken wires where they pass through the foam.
• Measure resistance: Disconnect the sensor from the harness and measure resistance at room temperature. Compare to cabinet NTC values; if open or shorted, it must be replaced.
• Replace sensor: Install a new De Dietrich-compatible evaporator NTC, clip it firmly to the same tube location, and ensure good thermal contact.
• Reassemble and test: Refit the rear liner, restore power, clear the error by cycling power, and verify that the unit cools and defrosts normally over 24 hours.