C5
Bosch
Indoor PCB Jumper / Configuration Error
C5 error and the unit may not start or may behave unpredictably.
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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
Incorrect jumper settings on indoor PCB, Wrong PCB installed for the model, Loose configuration plug, Corrupted configuration data
How to Fix / Troubleshooting
Safety first: Isolate power before opening the indoor unit.
Steps:
- Inspect jumpers: On the indoor PCB, check that configuration jumpers or DIP switches match the Bosch service manual for your model (capacity, voltage, etc.).
- Verify PCB part number: Ensure the installed PCB matches the original Bosch part number for your unit.
Resolution: If configuration is correct and C5 persists, the PCB may be defective and require replacement by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Indoor Main Control PCB
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