Wine cooler shows E5 and the compressor does not start or stops shortly after starting.

Critical safety: Unplug the wine cooler before removing the rear cover. Do not attempt to open the sealed refrigeration system. High voltage is present at the compressor terminals when powered.

Steps to troubleshoot E5:

• Access the compressor compartment: Remove the rear lower service panel to expose the compressor, start relay/PTC, and overload protector.
• Listen for clicking: When the unit is powered (briefly), a repeated clicking sound from the compressor area suggests the overload is tripping due to a bad relay or compressor.
• Check the start relay/PTC: With power disconnected, remove the relay from the compressor terminals. Shake it gently; if it rattles or shows burn marks, it is likely defective. Test resistance according to the part specification if available.
• Inspect the overload protector: Check for discoloration or a burnt smell. Measure continuity; an open overload at room temperature indicates failure.
• Replace faulty start components: Install a new SMEG-specified compressor start relay/PTC and overload protector. Ensure they are firmly seated on the compressor pins.
• Assess the compressor: If new start components do not resolve E5 and the compressor still fails to run or draws excessive current, the compressor may be seized or internally damaged. This requires replacement by a licensed refrigeration technician.
• Check the control PCB: If the compressor never receives power (no voltage at compressor terminals when it should run), the main control PCB may be defective and require replacement.

Warning: Do not bypass safety devices (overload or relay). Doing so can cause fire or permanent compressor damage.