E5 displayed, compressor may not start or may run briefly then stop; interior may warm up.

Safety: Unplug the wine cooler. The compressor and related components operate at mains voltage. Only proceed if you are comfortable working with electrical parts.

Steps:

• Access compressor compartment: Remove the rear lower service panel to expose the compressor, start device, and main control board.
• Inspect start device: The start relay/PTC and overload protector are usually housed in a plastic module attached to the compressor terminals. Check for burn marks, melted plastic, or a burnt smell.
• Check connections: Ensure all spade connectors are tight on the compressor and start device. Reseat any loose connectors.
• Test start relay/PTC: Remove the start device and measure resistance according to its specifications (often a few ohms). A rattling sound when shaken or infinite resistance can indicate failure.
• Test overload protector: Measure continuity across the overload. It should be closed (low resistance) at room temperature. An open overload that does not reset indicates failure.
• Replace faulty components: Install a Zanussi-compatible compressor start relay/PTC and overload protector if defective. Ensure correct orientation on the compressor pins.
• Monitor compressor operation: After reassembly and restoring power, listen for the compressor starting smoothly. If it hums and trips repeatedly, the compressor itself may be mechanically locked and require professional replacement.

Warning: Compressor replacement involves refrigerant handling and must be performed by an F-gas certified refrigeration technician.