P4 (Inverter Compressor Drive Error Diagnosis And Solution) - Bosch CLIMATE 5000 Service Manual

Troubleshooting

5.5.13 P4 (Inverter compressor drive error diagnosis and solution)

Description: 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.
Possible defects:
• Wiring mistake
• IPM malfunction
• Faulty outdoor fan assembly
• Compressor malfunction
• Faulty outdoor PCB
Troubleshooting and repair:
Check the wiring between the PCB
Check the compressor resistance
56
and compressor.
Is it improperly wired?
NO
Check the IPM.
Does it function
properly?
YES
Check the outdoor fan and the
outdoor unit ventilation.
Does it function
properly?
YES
values.
Are they within
acceptable ranges?
YES
Replace the outdoor PCB.
Ensure proper connections or replace the
YES
wires and connectors.
Replace the IPM board
NO
or the outdoor PCB.
Please refer to "Fan Speed
NO
Malfunction"
NO
Replace the compressor.
CLIMATE 5000 RAC SINGLE SPLIT (R32) – 6720894076 (2019/08)