Bosch Climate 5000 Series Service Manual page 58

Service Manual
8.6.5 Over-voltage or under-voltage protection (PC 10/PC 11/PC 12)
Error Code
Malfunction decision conditions
Supposed causes
Table 35
Troubleshooting:
Figure 59
5 8 |
PC 10/PC 11/PC 12
An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Power supply problems
f
System problems, such as leakage or blockage
f
Outdoor PCB faulty
f
Voltage protection
Check the voltage of
outdoor unit power; is
the voltage between
L(L1) and N(L2)
between 187~264VAC
Yes
Check whether the voltage of IPM
board P and N(GND) is normal?
DC277— 356V for 18K & 27K models
DC277- 410V for for 36K & 48K models
No
Replace bridge rectifiers,
and then check whether the
(for
system can run normally
48K model)*
No
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor PCB
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
No Check the power supply
* The bridge rectifier can be only
Yes
Yes
Yes
Problem is solved
replaced on 48K model. On all
other models, ODU PCBs should
be replaced as the bridge rectifier
is embedded in PCBs