Siemens LMV52 series User Manual page 16

Error Diagnostic
Device
code code
B7 38 O2M
B7 3E O2M
B7 3F O2M
B7 41 LMV5
B7 42 LMV5
BE 01 LMV5
16/17
Building Technologies Division User Manual LMV5...
List of error messages of LMV5 system
Display
No valid COx signal from PLL52
No valid COx signal from PLL52
No valid COx signal from PLL52
Cable connection to the PLL52
No valid COx signal from PLL52
disconnected
PLL52 is sending messages but these are
No valid COx signal from PLL52
incorrect
COx supervision must not be combined
COx operating mode is not with the setting for a temperature-
possible with the selected O2 compensated start mode in O2 trim
operating mode control. Both settings use the supply air
sensor
Meaning for the LMV5 system
Fault during copying of a parameter page
External plausibility fault.
This type of fault covers possible faults
occurring due to invalid presettings in the
drive commands. In response, the
presettings will be ignored
Internal plausibility fault.
This type of fault covers possible errors
that cannot practically occur
Troubleshooting
Reset the unit
Attention!
If fault occurred during parameterization:
Check the parameters changed last.
If fault cannot be rectified by the reset:
Restore parameters from AZL5.
Otherwise, replace the O2 module
Reset the unit
Attention!
If fault occurred during parameterization:
Check the parameters changed last.
If fault cannot be rectified by the reset:
Restore parameters from AZL5.
Otherwise, replace the O2 module
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
Check CAN wiring / check power supply PLL52...
Check cable connection / wiring to the PLL52
Parameterize the O2 start mode to standard or to
IgnPtWoutTC, or set COx supervision to deactivated.
CC1A7550.5en
07.07.2015