Bosch Climate 5000 Series Service Manual page 75

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