Bosch Climate 5000 Series Service Manual page 55

8.6.3 IPM board and outdoor main control board communication error (PC 40)
Error Code
Malfunction decision conditions
Supposed causes
Table 33
Troubleshooting:
Figure 54
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
PC 40
PCB main chip does not receive feedback from IPM module for 60 seconds.
Improper / Incorrect Wiring
f
Outdoor PCB faulty
f
Communication malfunction between
IPM board and outdoor main board
Is there at least one LED in
the IPM board light?
No
Check the signal wire between
the IPM module and the main
board, is it connected good?
No
Reconnect and retry. Is
error still display?
No
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor main
board, and then check
whether the system can run
normally
No
Replace the electric control
box
Yes
Yes
No
Yes
Yes
Trouble is solved
Service Manual
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