Bosch BMS500-AAU036-1AHCXC - Inverter Module (IPM) Malfunction (P6)

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.13 Inverter module (IPM) malfunction (P6)
Error Code PC 00
Malfunction decision conditions
When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show
"P6" and AC will turn off.
Supposed causes
f Improper / Incorrect Wiring
f IPM malfunction
f Outdoor fan assembly faulty
f Compressor malfunction
f Outdoor PCB faulty
Table 44
Troubleshooting:
Figure 79
IPM module protection
Check whether the voltage range
of P-N on IPM module is within normal
DC277-356V for 18K & 27K models
DC277-410V for 36K & 48K models
Yes
Yes
No
Yes
Check whether the input
power supply is correct?
208-230V, 1N, 60Hz
No No
Correct input
power supply and
check whether the system
can work normally?
Check whether the
power supply line is
connected correctly and
tightly
Yes
Connect it correctly
and tightly
No
Check whether the connecting
line between the main board and
the IPM module is connected
tightly
Yes
Connect it tightly
No
No
No
Connect it well
Check whether the
connecng line of the
compressor is ght and
connected correctly
Replace the IPM module,
and check whether the system
can operate normally?
No
No
Replace the PCB and check
whether the system can work
normally?
No
Replace the compressor, and
check whether the system can
work normally?
Check whether the lines
in E-part box are
connected tightly
Yes
Connect it tightly No
No
Yes
No
Replace the bridge rectifiers
Check whether the bridge rectifiers are
normal? Use the multimeter to measure
the resistance between each two
terminals, check whether the
value of resistance is 0
Check whether the connecting line of
reactors are normal? If the line is broken,
the resistance of the two ports should be
∞˗Check whether the PFC module is
broken (applicable for 36K & 48K regular
Replace the connecting line,
reactor, or the PFC
module (for 36K & 48K regular
mul zone models)
Yes
No
No
Yes
Problem is solved
Check if the outdoor fan
runs normally and is
venlated properly
No
Follow troubleshoong steps
outlined in Secon 8.6.7.
Outdoor fan speed
malfuncon (E8)
Yes
Yes
Yes
mul zone)