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Building Technologies Division User Manual LMV5... CC1A7550.5en
List of error messages of LMV5 system 07.07.2015
Error
code
Diagnostic
code
Device Display Meaning for the LMV5 system Troubleshooting
B7 38 O2M
No valid COx signal from PLL52
Fault during copying of a parameter page 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
B7 3E O2M
No valid COx signal from PLL52
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
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
B7 3F O2M
No valid COx signal from PLL52
Internal plausibility fault.
This type of fault covers possible errors
that cannot practically occur
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 41 LMV5 No valid COx signal from PLL52
Cable connection to the PLL52
disconnected
Check CAN wiring / check power supply PLL52…
B7 42 LMV5 No valid COx signal from PLL52
PLL52 is sending messages but these are
incorrect
Check cable connection / wiring to the PLL52
BE 01 LMV5
COx operating mode is not
possible with the selected O2
operating mode
COx supervision must not be combined
with the setting for a temperature-
compensated start mode in O2 trim
control. Both settings use the supply air
sensor
Parameterize the O2 start mode to standard or to
IgnPtWoutTC, or set COx supervision to deactivated.
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