Display shows E5 and the refrigerator may not cool or may cycle erratically; compressor may not start reliably.

Safety first: Unplug the refrigerator. Work only on accessible external components; sealed system work should be done by a licensed technician.

Steps:

• Access compressor compartment: Remove the lower rear cover to expose the compressor, start device, and (if present) inverter module.
• Check wiring: Inspect the harness and connectors to the compressor and inverter for loose plugs, burn marks, or melted plastic. Reseat any loose connectors.
• Inspect start relay/PTC: On non-inverter models, remove the plastic start relay/PTC from the compressor terminals. Shake it gently; if it rattles or smells burnt, it is likely defective.
• Replace start device if suspect: Install a new Etna compressor start relay/PTC matched to your compressor model. Ensure it is firmly seated on the compressor pins.
• Inverter models: If your Etna refrigerator uses an inverter module, check for LED error indications on the inverter (if present) and ensure it is firmly mounted and connected. A failed inverter module typically requires replacement as a unit.
• Test operation: Restore power and listen for the compressor starting smoothly. If E5 persists and the compressor does not run or overheats quickly, a professional sealed-system diagnosis is required.