Wine cooler not cooling at all; interior at room temperature, compressor silent, display may still be on.

Safety first: Unplug the cooler before accessing the rear compartment or control board.

• Check basic power: Confirm the outlet has power by testing with another appliance. Verify the cooler's power cord is intact and fully plugged in.
• Listen for operation: When plugged in, check if any fans run or if the display responds. If completely dead, suspect power supply or main board.
• Inspect compressor start components: Remove the rear panel and locate the compressor. Check the start relay and overload protector for burn marks or loose connections. Replace with a "Phiestina compressor start relay/overload" if damaged.
• Check control board output (advanced): With appropriate tools and training, a technician can verify whether the main control board is sending power to the compressor. If not, replace the "Main control board".
• Sensor check: A failed sensor reading may prevent the board from calling for cooling. Inspect and replace the "Cabinet temperature sensor" if the display shows unrealistic temperatures.
• Professional diagnosis: If the compressor receives proper power but does not start or is locked, a sealed-system technician is required.