Display shows E11 and the upper and lower zones (on dual-zone models) do not maintain independent temperatures.

Safety: Unplug the dual-zone Blastcool wine cooler before removing interior panels or control covers.

• Identify affected zone: Compare setpoints and actual temperatures in both zones. Determine whether one or both zones are misreading.
• Check each zone sensor: Each zone typically has its own NTC sensor on the rear or side wall. Remove the interior covers and inspect sensor placement and wiring.
• Swap sensor connectors (advanced): On some models, you can temporarily swap the upper and lower zone sensor plugs on the PCB. If the error or misreading follows the sensor, the sensor is faulty; if it stays with the zone, the PCB or wiring is suspect.
• Inspect interzone harness: Dual-zone models may have a harness linking a secondary control board to the main PCB. Ensure all connectors are fully seated.
• Replace faulty sensor: Install a new Blastcool upper zone NTC sensor or lower zone NTC sensor as required.
• Reassemble and test: Restore power and verify that each zone now reads correctly and that E11 clears.

If both sensors test good and wiring is intact, the dual-zone control logic on the main PCB may be defective and should be replaced by a technician.