Wine cooler shows E3 and interior light and fan may work, but compressor does not start or cycles erratically.

Safety: Unplug the appliance before removing the control panel or top trim.

Steps to troubleshoot:

• Locate the ambient sensor: On many Fagor wine coolers, the ambient sensor is located near the front control panel or behind the top grille, sensing room temperature.
• Remove the control panel bezel: Carefully pry off the plastic trim (if applicable) and remove screws securing the control panel. Gently pull it forward to access the wiring.
• Identify the sensor connector: Look for a small two-wire harness labeled "AMB" or similar on the main PCB. Follow it to the sensor.
• Inspect and reseat: Disconnect and reconnect the sensor plug several times to clean contacts. Check for pinched or cut wires.
• Test resistance: With the unit unplugged, measure the sensor resistance at room temperature. Compare to expected NTC values (often 5–10 kΩ at 25°C). Replace if open, shorted, or far out of range.
• Replace the ambient sensor: Install a new Fagor ambient NTC sensor if faulty, routing the harness away from hot components and sharp edges.
• If E3 persists: The main control board may not be interpreting the sensor correctly. Replace the main PCB.

Tip: An incorrect ambient reading can cause the unit to shut down in cold rooms; ensure the cooler is installed within the specified ambient temperature range.