Siemens LMV52 series - 5 List of Error Messages of LMV5 System

13/17
Building Technologies Division User Manual LMV5... CC1A7550.5en
List of error messages of LMV5 system 07.07.2015
5 List of error messages of LMV5 system
Error
code
Diagnostic
code
Device Display Meaning for the LMV5 system Troubleshooting
B6 # LMV5 COx alarm error messages
B6 01 LMV5 COx value invalid
COx signal is not within the defined range
of values or there is a cable break.
Check connection between the COx sensor and PLL52, check
cable connection on the PLL52 basic unit, correct resistance
dimensioning
B6 02 LMV5
COx monitoring time COx alarm
undefined
No valid value has been entered in the
parameter Time COx Alarm
Set Time COx Alarm parameter correctly
B6 03 LMV5
COx monitoring time constant Tau
undefined
Missing path time constant
Perform adaption of O2 trim control, Tau Low-Fire and / or Tau
High-Fire have no valid value
B6 04 LMV5 COx limit exceeded in operation COx indicated by COx sensor Optimize combustion settings
B6 05 LMV5 COx limit exceeded in prepurge COx indicated by COx sensor Optimize combustion settings
B7 # LMV5 PLL52 error during active COx supervision
B7 00..3E LMV5...
COx supervision
No valid COx signal from PLL52
Error messages from the PLL52... when
COx supervision is active
Check the supply air temperature at the connection (short-
circuit, open-circuit) Check the ambient temperature
B7 01 O2M
No valid COx signal from PLL52
CRC fault during ROM test
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 02 O2M
No valid COx signal from PLL52
CRC fault during RAM test
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 04 O2M
No valid COx signal from PLL52
Fault during key value check
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 05 O2M
No valid COx signal from PLL52
Error code for time block overflow
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 07 O2M
No valid COx signal from PLL52
Sync fault or CRC fault
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 08 O2M
No valid COx signal from PLL52
Error code for main loop counter
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 09 O2M
No valid COx signal from PLL52
Fault during stack test
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 0A O2M
No valid COx signal from PLL52
Feedback values invalid
If fault occurs sporadically: Improve EMC.
If fault occurs constantly: Replace the defective O2 module
B7 10 O2M
No valid COx signal from PLL52
Nernst voltage outside the valid range Check the connection (correct polarity, short-circuit)
B7 12 O2M
No valid COx signal from PLL52
Thermo couple voltage outside the valid
range
Check connections (polarity, short-circuit, open-circuit).
Check power supply to the O2 module.
Check fuse F2 on the O2 module.
Check heating control on the QGO.