Freezer temperature fluctuates widely; sometimes too warm, sometimes too cold.

Safety first: Unplug the freezer before accessing sensors or the control board.

• Check loading: Avoid blocking air vents inside your Fagor freezer with large packages. Allow space for air circulation.
• Inspect sensor wiring: Ensure the cabinet sensor connector is firmly seated and wires are not damaged.
• Replace thermostat/sensor: If temperature swings are large and random, replace the thermostat (mechanical models) or NTC sensor (electronic models) with OEM parts.
• Control board: Persistent instability after sensor replacement may indicate a faulty control board that needs replacement.