Safety: Unplug the freezer. The control board carries live mains voltage when powered.

Check basic power: Confirm the wall outlet has correct voltage and the freezer plug and cord are intact.
Access main control board: On many Bauknecht freezers, the board is located in a rear control box or top housing. Remove the cover screws and carefully expose the PCB.
Inspect visually: Look for burnt areas, cracked solder joints near the compressor relay, or swollen capacitors.
Check connectors: Ensure all harness plugs are fully seated and not heat-damaged.
Relay test (advanced): With the board removed and using a multimeter, you can check continuity across the relay contacts (unpowered). However, full relay diagnosis usually requires live testing and should be done by a professional.
Board replacement: If there is visible damage or F8 persists after reseating connectors, replace the main control board with the exact Bauknecht part number. This is typically a level-5 repair and best left to an authorized technician.

Error F8, alarm beeping, temperature rising, compressor not starting at all

Possible Causes