Wine cooler displays E5 and may not reach set temperature; compressor may short-cycle or not start.

Critical safety: Unplug the appliance before working near the compressor or electrical components. Capacitors can hold a charge; discharge safely if removed.

Steps to troubleshoot E5:

• 1. Access compressor compartment: Remove the rear lower service panel to expose the compressor, start device, and control board area.
• 2. Visual inspection: Look for burnt connectors, melted plastic on the start relay/PTC, or signs of overheating on the compressor terminals.
• 3. Check wiring connections: Ensure all spade connectors on the compressor and start device are tight and not corroded. Reseat any loose connections.
• 4. Test start relay/PTC: Remove the start device from the compressor and shake it gently; if it rattles excessively or shows burn marks, it is likely faulty. Use a multimeter to check continuity per Gaggenau specs.
• 5. Test run capacitor (if equipped): Discharge the capacitor, then measure capacitance with a meter. Replace if more than ±10% out of rated value or if bulged/leaking.
• 6. Evaluate compressor: If start components test good, measure compressor winding resistance between terminals. Very high or zero readings may indicate a failed compressor, which requires professional replacement.
• 7. Inspect control board relay: Check the main control board for a stuck or burnt compressor relay. If damaged, replace the control module.
• 8. Reassemble and test: After replacing any faulty parts, reinstall the rear cover, restore power, and monitor compressor start-up and cooling performance.

Note: Compressor replacement involves refrigerant handling and must be performed by a licensed refrigeration technician.