Safety: Disconnect power before accessing internal wiring or sensors.

Steps for dual-zone Fagor wine coolers:

Identify zones: Note which zone (upper or lower) is not maintaining temperature correctly.
Check sensor part numbers: If sensors were previously replaced, verify that the correct Fagor NTC sensor part numbers are installed in each zone. Using non-matching sensors can trigger E8.
Inspect wiring harness: Access the rear or side panels to trace the sensor wires from each zone to the main PCB. Ensure connectors are plugged into the correct labeled sockets (e.g., Z1, Z2).
Test each zone sensor: Disconnect and measure resistance of each zone's cabinet sensor at the same ambient temperature. Readings should be similar. Replace any sensor that is open, shorted, or significantly different.
Reset control: After correcting wiring or replacing sensors, unplug the unit for 5–10 minutes to reset the control board, then power on and monitor.
Firmware/board issue: If all sensors and wiring are correct and E8 persists, the main control board may have a firmware or hardware fault. Replace the main PCB with the correct revision for your model.

Wine cooler displays E8 and interior temperature fluctuates widely; unit may short-cycle.

Possible Causes