Bosch BMS500-AAU036-1AHCXC - Over;Under Voltage Protection (PC 10, 11, 12)

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.5 Over-voltage or under-voltage protection (PC 10/PC 11/PC 12)
Error Code PC 10/PC 11/PC 12
Malfunction decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
Supposed causes
f Power supply problems
f System problems, such as leakage or blockage
f Outdoor PCB faulty
Table 35
Troubleshooting:
Figure 59
Voltage protection
Checkthe voltage of
outdoorunit power; is
thevoltage between
L(L1) andN(L2)
between187~264VAC
Checkthe power supply
Checkwhether the voltageof IPM
boardPand N(GND) is normal?
DC277
— 356V for 18K & 27K models
DC277- 410V for for 36K & 48K models
Replacebridge rectifiers,
and then checkwhether the
systemcan runnormally
(for
48K model)*
Replace IPM board, and
then check whetherthe
system canrun normally
Replaceoutdoor PCB
Yes
No
No
No
No
Yes
Problem is solved
Yes
Yes
* The bridge rectifier can be only
replaced on 48K model. On all
other models, ODU PCBs should
be replaced as the bridge rectifier
is embedded in PCBs