High-pitched whistling or whooshing noise from inside the wine cooler.

Safety: No electrical work is usually required, but unplug if removing panels.

Steps to reduce noise:

• Rearrange bottles: Move bottles away from air outlets and inlets to reduce turbulence.
• Check fan ducts: Remove interior panel and ensure fan blades are centered in the duct and not rubbing.
• Secure ducts: Tighten any loose screws or clips holding air channels.
• Accept some noise: Mild whooshing during compressor operation can be normal for Neff wine coolers and does not indicate a fault.