Siemens LMV5 Series Basic Documentation page 230

Error Diagnostic Device
code code
B0 02 BU
B1 01 BU
B5 # BU
B5 01 BU
B5 02 BU
B5 03 BU
B5 04 BU
B5 05 BU
B5 06 BU
B5 07 BU
BA 01 BU
BF
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Siemens Building Technologies Basic Documentation LMV51...
HVAC Products 15 Addendum 1: List of fault status messages of LMV51... system
Display
Internal Fault Basic Unit Fault during ZR test
Internal Fault Basic Unit
Fault during short-circuit test between
inputs and outputs
O2 monitor
Below O2 Min Value O2 value has dropped below O2 min.
value
O2 Min Values undefined Invalid O2 min. value
O2 Setpoints undefined Invalid O2 setpoint
O2 Delay Time undefined Invalid O2 delay time
Actual O2 Value invalid No valid actual O2 value in operation for
>= 3 s
O2 Value Prepurging not During prepurging, the parameterized air
reached oxygen content of +-2 % was not reached
O2 Value in Operation too high O2 value of 15 % in operation was
exceeded
O2 Sensor Test aborted O2 sensor test was not successful. E.g.
reset of O2 module during probe test
O2 Control and Limiter Fault occurred in connection with O2 trim
automate deactivated control or with the O2 monitor. It led to
automatic deactivation of O2 trim control
or the O2 monitor
Meaning for the LMV5x system Troubleshooting
*1)
*1)
Check setting of the ratio curve.
Increase interval between O2 setpoint and O2 min. value
Define all O2 min. values
Define all O2 setpoints
Adaption at curvepoint 2 or at the highest curvepoint has not
been made. Set these curvepoints
O2 module and O2 sensor must be correctly connected.
Mains power supply to the QGO must be connected
At the end of prepurging, the parameterized "O2 content air"
must be reached.
Prepurging may not be sufficiently long for the air to reach
the O2 content in the flueways.
The value must have been parameterized at an air oxygen
content of 20.9 %.
If fault occurs after more than 1 year, QGO may have
reached the end of its service life -> replace
Check mechanical and electrical mounting of the QGO
sensor
*2)
The fault history shows the reason for switching off just
before the "BF" fault
CC1P7550en
01.10.2003