Freezer not starting at all, no lights, no display, completely dead.

Safety first: Always unplug the freezer before opening any panels. Work on mains circuits only if competent.

Steps:

• Check outlet and breaker: Test the wall socket with another appliance. Reset any tripped breakers or replace blown fuses.
• Inspect power cord: Look for cuts, burns, or kinks. Replace the cord if damaged.
• Check mains filter: Remove the rear panel and locate the mains filter/entry module. Ensure all connectors are firmly seated and there are no burnt components.
• Internal fuse: Some Grundig models have an internal fuse on the main PCB. If accessible and blown, replace only with the same rating and investigate the cause.
• Professional help: If you cannot identify the fault or if the internal wiring appears damaged, contact a qualified technician.