Service Manual Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 57
Bosch Thermotechnology Corp. | 04.2020
Data subject to change
8.12 Inverter compressor drive error (P4)
Error Code P4
Malfunction decision conditions
An abnormal inverter compressor drive is detected by a special detection circuit, including
communication signal detection, voltage detection, compressor rotation speed signal detection and so
on.
Supposed causes
f Wiring mistake
f IPM malfunction
f Outdoor fan assembly faulty
f Compressor malfunction
f Outdoor PCB faulty
Table 35
Troubleshooting:
Figure 55
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
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