Wine cooler not cooling at all; interior at room temperature, display appears normal.

Safety first: Unplug the unit before removing the rear panel. Do not attempt to open or solder on the sealed refrigeration system.

Diagnostic steps:

• Listen and feel: With the unit plugged in and calling for cooling, the compressor should hum and vibrate slightly. If silent and cool to the touch, it is not starting.
• Check condenser fan: If the fan does not run either, suspect a control or power issue rather than just the compressor.
• Inspect start device: Remove the compressor terminal cover and inspect the start relay/PTC and overload for burning or damage. Replace with a Hoover-compatible start device if suspect.
• Check main PCB output: Verify that the compressor output from the main PCB is supplying voltage when cooling is demanded (this is a job for a qualified person with a multimeter).
• Refrigerant issues: If the compressor runs but there is no cooling and the condenser does not get warm, there may be a refrigerant leak or internal blockage. This requires a certified refrigeration technician to locate leaks, evacuate, and recharge the system.