Bosch BMS500-AAU036-1AHCXC - Compressor Lack Phase Protection (PC 43); Outdoor Unit IR Chip Drive Failure (PC 45)

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.16 Outdoor compressor lack phase protection (PC 43)
Troubleshooting:
Figure 82
Checkthe compressor three-
phaseoutput forobvious
open circuit
Poweroff,then restart theunit
2minutes later.Is it still
displaying theerror code
Theunit operates
normally
Check bothends of
comp ressor connecting
line .Are allthe connections
good?
Correct theconnections
Checkwhether thethree-
phaseresistanceof the
comp ressor is symmetrical
Replacethe compressor
Yes
Yes
Yes
No
No
No
Replacethe main PCB
No
Trouble is solved
Yes
8.6.17 Outdoor unit IR chip drive failure (PC 45)
Troubleshooting:
Figure 83
Poweroff,then restart theunit
2minutes later.
Replacethe inverter module
PCB.
Yes