Bosch Climate 5000 Series Service Manual page 61

7.6.14 Communication error between outdoor unit main PCB and IPM
control (PC 40)
Error Code
Malfunction decision conditions
Supposed causes
Table 43
Troubleshooting:
Figure 61
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
PC 40
Communication error between outdoor PCB chip and compressor driven chip

Outdoor PCB faulty

Outdoor electric control box faulty
Shut off the power supply and
Shut off the power supply and
turn it on 2 minutes later .
turn it on 2 minutes later .
Is it still displaying
Is it still displaying
the error code ?
the error code ?
Replace outdoor main board
Replace outdoor main board
If the system can run
If the system can run If
normally ?
normally ?
NO
Replace the electric control box
Replace the electric control box
NO
YES
Trouble is solved
Trouble is solved
Service Manual
| 61