Inverter Compressor Drive Error (P4) - Bosch Climate 5000 Series Service Manual

Service Manual

8.12 Inverter compressor drive error (P4)

Error Code
Malfunction decision conditions
Supposed causes
Table 35
Troubleshooting:
Check the wiring between main PCB
and compressor
Check the outdoor fan and the
Check the compressor resistance
Replace the outdoor main PCB
Figure 55
Bosch Thermotechnology Corp. | 04.2020
P4
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.
Wiring mistake
IPM malfunction
Outdoor fan assembly faulty
Compressor malfunction
Outdoor PCB faulty
No
Check the IPM
Yes
outdoor unit ventilation
Yes
values
Yes
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 57
Correct the connection or replace
Yes
the wires and connectors.
Replace the IPM board or replace
No
Please refer to the solution of 【Fan
No
Speed Has Been Out Of Control】
No Replace the compressor.
the main PCB
malfunction
Data subject to change