How to troubleshoot a sub-zero refrigerator that is experiencing temperature fluctuations?

To troubleshoot a Sub-Zero refrigerator experiencing temperature fluctuations, follow these steps:
1. Check the temperature settings: Ensure the refrigerator and freezer temperatures are set correctly. Recommended temperatures are around 37°F (3°C) for the refrigerator and 0°F (-18°C) for the freezer.
2. Clean the condenser coils: Dust and debris on the coils can affect cooling efficiency. Clean them using a coil brush or vacuum cleaner.
3. Verify the door seal: Inspect the rubber gaskets around the doors for any damage or gaps. Replace them if needed to maintain a proper seal.
4. Check the evaporator fan: Test the evaporator fan to ensure it's working correctly, as it circulates cold air inside the refrigerator.
5. Monitor for changes: Allow time for the refrigerator to stabilize after adjustments. If the issue persists, contact a professional Sub-Zero technician for further diagnosis and repair to ensure consistent and stable temperatures.