Wine cooler shows E5 and may not cool; compressor or Peltier module may not start.

Safety: Unplug the cooler. High voltage is present at the compressor and power board. If you are not experienced with electrical testing, seek professional service.

Diagnosis steps:

• Listen for operation: After plugging in (briefly), listen for compressor hum or Peltier fan noise. If E5 appears and nothing starts, a drive fault is likely.
• Inspect the power/control board: Remove the rear panel and visually inspect the main control board for burned spots, cracked solder joints, or melted relays.
• Check compressor components (compressor models): With power off, remove the compressor cover and test the PTC start relay and overload protector for continuity. Test compressor windings for continuity and equal resistance between terminals.
• Check Peltier module (thermoelectric models): Inspect the Peltier module and its wiring. Look for discoloration, cracks, or melted insulation. Test for continuity across the module; an open circuit indicates failure.
• Replace failed parts: Replace the defective compressor start relay/overload, Peltier module, or main control board as indicated by testing.

Warning: Do not attempt to open or braze the sealed refrigeration system yourself; this requires EPA-certified service.