Wine cooler emitting high-pitched whine or electronic buzzing from control area

Safety: Unplug the appliance before opening the control housing. Components on the PCB can retain charge.

• Isolate source: With the unit briefly powered (only if safe), listen closely to identify whether the noise comes from the control panel, rear PCB, or a fan. Then unplug before proceeding.
• Check fans: Inspect all fans (internal and external) for dust build-up and worn bearings. Replace any fan that squeals or grinds when spun by hand.
• Secure PCB: Ensure the main PCB is firmly screwed down and not vibrating against the cabinet. Add insulating washers if needed.
• PCB replacement: If the noise clearly comes from a transformer or inductor on the board and is excessive, the main control board may need replacement. This is usually a professional repair.