Siemens LMV51.000B2 - Page 250

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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 16 Addendum 1: List of fault status messages of LMV5... system 13.08.2004
Error
code
Diagnostic
code
Device Display Meaning for the LMV5x system Troubleshooting
3 01 BU Missing or faulty Control Pa-
rameters
PID parameter for controller algorithm
missing
Check controller parameters
*1)
If fault occurs sporadically: Improve EMC
If fault occurs constantly: Replace defective module
*2)
If fault occurs sporadically: Improve EMC
If fault occurs constantly: Replace defective module