The wine cooler is not cooling at all; the interior stays at room temperature, and no cold air is felt.

Safety: Unplug the unit before inspection. High voltage is present inside.

Steps:

• 1. Confirm power: Ensure the display lights up and controls respond. If the unit is completely dead, troubleshoot the power supply first.
• 2. Listen for operation: With the unit plugged in and calling for cooling, listen for compressor hum or fan noise. If silent, suspect the control board or start components.
• 3. Check fans: If fans run but no cooling occurs, test the Peltier module (thermoelectric) or the sealed system (compressor).
• 4. Inspect start relay/overload: On compressor models, remove the compressor terminal cover and inspect the start relay and overload protector. Replace it if burned or open.
• 5. Test Peltier module: On thermoelectric models, measure the resistance of the module and replace it if open/shorted.
• 6. Professional service: If the compressor is running but no cooling occurs, the refrigerant system may be compromised and must be serviced by a licensed technician.