Bosch Climate 5000 Series Service Manual page 79

8.6.18 Communication malfunction between adapter board and outdoor
main control board (ODU Ed)
Error Code
Malfunction decision conditions
Supposed causes
Table 46
Troubleshooting:
Figure 84
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
ODU Ed
If outdoor PCB does not receive feedback from adapter board.
Wiring mistake
f
Faulty PCB
f
Power off, then restart the unit after 3
minutes.
Does a problem remain?
YES
Check the wirings and connections
Are all the
connections good?
YES
Replace the adapter main
PCB
Does the error still
exist?
YES
Replace the outdoor main control
board
NO The unit is operating normally
NO Ensure proper connections
NO The problem is solved
Service Manual
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