Siemens LMV5 Series Technical Instructions page 264

Error Diag.
Device Display
Code Code
O2 Value in
07 Operation too
high
O2 - Parameter
08 points of curve
undefined
B5
Testing period for
minimum O2
09
values not
defined
Internal Fault
0A
LMV5..
Basic Unit
O2 Sensor Test
BA 01
aborted
Service interval
BB 00 reached for O2
sensor test
BE Any #
O2 mode with
FGR is not
BE 00 possible with
selected temp.
sensor
O2 trim control
BF Any # automatically
deactivated
Section 7
Meaning for the LMV5x System
Fault with Base Unit (LMV5) or Oxygen Sensor (QGO2..)
O2 MaxValue or O2 MaxCurve was exceeded
The curves for minimum / maximum O2 values are incomplete
or no adaption has yet been carried out to determine the Tau
values
No value has been specified for the testing period (parameter
Time O2 Alarm)
-
O2 sensor test was not successful. E.g. reset of O2 module
during probe test
The O2 trim control is removed and the system moves along
the set ratio control curves
Invalid parameterization of O2 operating mode / flue gas
recirculation sensor / COx monitoring
An error occurred in connection with the O2 trim control / O2
alarm and flue gas recirculation functionality
Fault occurred in connection with O2 trim control or with the O2
monitor. It led to automatic deactivation of O2 trim control or
the O2 monitor
1) Check mounting of O2 sensor. Ensure no air is
entering the stack upstream of the sensor.
2) Verify that the O2 level in the stack has not
exceeded the maximum value set by O2 MaxValue or
the O2 value of the ratio control curve.
1) Check O2 min (guard) curve to ensure all points
have a value.
2) If parameter Type O2 MaxValue is set for O2
MaxCurve, ensure all points on ratio control curve have
a valid O2 value.
Enter a valid value for parameter Time O2 Alarm
1) If fault occurs sporadically, reduce electrical noise.
2) If fault occurs continuously, replace LMV5.
1) If fault occurs sporadically, reduce electrical noise.
2) If fault occurs continuously, replace PLL5..
Fault occurs because the time set in parameter
O2SensServTim has elapsed. Carry out maintenance
or replace O2 sensor.
Set O2 mode (OptgMode ) to O2 Alarm or O2 Control,
or set flue gas recirculation temp sensor (FGR-sensor )
See previous error code in fault history (typically B5
error codes). This will detail the reason for the
automatic deactivation.
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