Bosch IDS 2.0 - LO-L9 Troubleshooting

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Bosch IDS 2.0 Service Manual
07.2021 | Bosch Thermotechnology Corp.
Data subject to change
12.3.17 LO-L9 Troubleshooting
LED display output: LO-L9
Description: The IPM module protection
Possible causes:
 Control board failed
 Compressor failed
 Abnormal pressure
Table 45
Procedure:
Figure 32
Replace compressor
Yes
No
Yes
Correct power supply
Remove blockage
No
Yes
Is the power supply
stable?
Is there any
blockage in the
refrigerant pipe?
No
Yes
Open the service valves
Are the service
valves closed?
No
Is there any
abnormal noise
from the
compressor?
Check the refrigerant
charge, refer to IOM
Yes
No
Does the unit run
normally for at least
1 hour?
Power off and wait 3 minutes
before powering on
Replace control board
Replace compressor
Is the compressor
operating normally? 
Yes
No
1) See Section 13.8