Wine cooler shows E19 and the internal temperature display may be blank or show dashes for one zone.

Safety: Disconnect power before removing interior panels or accessing sensors.

Steps:

• 1. Determine affected zone: Note whether the upper or lower zone temperature is missing or incorrect.
• 2. Locate zone sensor: Each zone typically has its own NTC sensor behind the side or rear liner. Remove shelves and the appropriate panel to access it.
• 3. Inspect sensor and wiring: Check for physical damage, loose mounting, or broken wires.
• 4. Test sensor resistance: Disconnect the sensor and measure resistance at known temperature. Compare to Gaggenau’s NTC chart. Replace if out of range.
• 5. Check harness to control board: Verify continuity from the sensor connector to the control board. Repair any open circuits.
• 6. Replace control board if necessary: If sensors and wiring are good but the board does not read them, replace the main control module.
• 7. Reassemble and test: Restore power and confirm that both zone temperatures display correctly and E19 is cleared.

Note: Accurate zone sensing is critical for proper wine storage; do not operate long-term with a known sensor fault.