Bosch R32 - P4 (Inverter Compressor Drive Error Diagnosis and Solution)

56 CLIMATE 5000 RAC SINGLE SPLIT (R32) – 6720894076 (2019/08)
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:
YES
YES
YES
YES
NO
NO
NO
NO
Ensure proper connections or replace the
wires and connectors.
Replace the compressor.
Replace the outdoor PCB.
Replace the IPM board
ortheoutdoor PCB.
Please refer to “Fan Speed
Malfunction”
Does it function
properly?
Does it function
properly?
Are they within
acceptable ranges?
Is it improperly wired?
Check the wiring between the PCB
and compressor.
Check the outdoor fan and the
outdoor unit ventilation.
Check the compressor resistance
values.
Check the IPM.