F5
Bauknecht
Main Control Board Failure
Microwave shows F5 and will not start; sometimes appears after a power surge.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Internal control board relay failure, Damaged microcontroller from surge, Burned solder joints or tracks on PCB
How to Fix / Troubleshooting
Safety first: Unplug the appliance before inspection. Do not attempt component-level repair on the high-voltage side.
- Step 1 – Power cycle: Disconnect power for 10–15 minutes, then reconnect. If F5 reappears immediately, the control board is likely faulty.
- Step 2 – Visual inspection: Remove the control panel to access the main PCB. Look for burn marks, bulging capacitors, or cracked solder joints, especially around relays.
- Step 3 – Check connectors: Ensure all harness connectors to the control board are fully seated and not heat-damaged.
- Step 4 – Replacement: If visible damage is present or the code persists, replace the main control board (power/control module) with the exact Bauknecht part number for your model.
- Note: Because the control board interfaces with high-voltage circuits and safety interlocks, replacement is best performed by an authorized technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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