Display shows E8 and the compressor may not start or may run only briefly before stopping.

Danger: Compressor and inverter circuits carry mains voltage and can store charge. Unplug the refrigerator and wait several minutes before touching components. If you are not experienced with electrical work, contact a technician.

• Check ventilation and condenser: Ensure the rear of the fridge has adequate clearance and the condenser coils are clean. Overheating can cause compressor protection to trip.
• Listen for compressor behavior: A repeated clicking sound every few minutes suggests a start relay or overload issue.
• Access compressor compartment: Remove the rear lower service panel to expose the compressor, start device, and (if fitted) inverter module.
• Inspect wiring and connectors: Look for burned or loose connectors on the compressor terminals and inverter/start relay.
• Test start relay/overload (non-inverter): Remove the PTC relay and overload protector from the compressor. Shake the relay gently; if it rattles excessively or shows burn marks, replace it with a Grundig-compatible start device.
• Check inverter status (inverter models): Some inverters have status LEDs. If the inverter board is visibly burned or emits a burnt smell, it likely needs replacement.
• Compressor test: Measure winding resistances between compressor terminals. Very high or zero readings may indicate internal failure, which requires compressor replacement by a refrigeration technician.
• Reassemble and test: After replacing the start device or inverter, restore power and monitor compressor operation and E8 status.

Because of the high voltage and refrigerant system involvement, most E8-related repairs beyond basic checks should be handled by a qualified service technician.