Service Manual Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump | 39
Bosch Thermotechnology Corp. | 02.2018
Data subject to change
8.3.8 IPM malfunction or IGBT over-strong current protection diagnosis and
solution(P0)
Error Code P0
Malfunction decision conditions
When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show
“P0” and AC will turn off .
Supposed causes
f Wiring mistake
f IPM malfunction
f Outdoor fan assembly faulty
f Compressor malfunction
f Outdoor PCB faulty
Table 23
Troubleshooting:
Figure 36
Check the wiring between main PCB
and compressor
Correct the connection or replace
the wires and connectors.
Yes
No
Check the IPM No
Yes
Replace the IPM board or replace
themainPCB
Check the outdoor fan and the
outdoor unit ventilation
No
Please refer to the solution of 【Fan
Speed Has Been Out Of Control】
malfunction
Yes
Check the compressor resistance
values
No
Replace the compressor.
Yes
Replace the outdoor main PCB
In most cases the main PCB will fail before the compressor fails. To check
if the compressor fails, check the coloring of the material wrapped around
the compressor. If the part that touches the compressor has turned
brownish due to the compressor running hot, then the compressor most
likely has failed.
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