Bosch BMS500-AAS009-1CSXHB User Manual

Service Manual Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 63
Bosch Thermotechnology Corp. | 04.2020
Data subject to change
8.18 Communication error between outdoor unit main PCB and IPM
control (J4)
Error Code J4
Malfunction decision conditions Communication error between outdoor PCB chip and compressor driven chip
Supposed causes
f Wiring Mistake
f Outdoor PCB faulty
f Outdoor electric control box faulty
Table 41
Troubleshooting:
Figure 61
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Communication error between outdoor main
chip and compressor driven chip
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Is there at least one LED in the
compressor driven chip light?
Check the wiring between the
compressor driven chip
and the main PCB.
Correct the connecon
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lace
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Replace Compressor driven
Chip. Is the system running
normally?
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Replace the electric control box
No
No
No
No
Yes
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?
Replace outdoor main PCB
Is the system running
normally?
No
Yes

Bosch BMS500-AAS009-1CSXHB Specifications

General

Brand	Bosch
Model	BMS500-AAS009-1CSXHB
Category	Air Conditioner
Language	English