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Siemens Building Technologies
Basic Documentation LMV5...
CC1P7550en
HVAC Products
16 Addendum 1: List of fault status messages of LMV5... system
13.08.2004
Error
code
Diagnostic
code
Device
Display
Meaning for the LMV5x system
Troubleshooting
B5
06
BU
O2 Value Prepurging not
reached
During prepurging, the parameterized air
oxygen content of +-2 % was not reached
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
B5
07
BU
O2 Value in Operation too high
O2 value of 15 % in operation was ex-
ceeded
Check mechanical and electrical mounting of the QGO sen-
sor
BA
01
BU
O2 Sensor Test aborted
O2 sensor test was not successful. E.g.
reset of O2 module during probe test
*2)
BF
O2 Control and Limiter auto-
mate deactivated
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
The fault history shows the reason for switching off just
before the "BF" fault
C5
#
#
Version Conflict
When comparing the versions of the indi-
vidual units, the AZL5... has detected old
versions
Before replacing any units, start the system and wait about
1 minute (until, after entering the parameter level, the dis-
play “Parameters will be updated“ disappears).
Then, make a reset. Replace the unit only if the fault mes-
sage does not disappear.
Replace the relevant units by new versions
C5
01..2F
#
Version Conflict
The diagnostic value is made up of the fol-
lowing faults or their combinations (the in-
dividual diagnostic codes are added up in
hexadecimal format)
C5
01
BU
Version Conflict
Software of the basic unit too old
Replace basic unit
C5
02
LC
Version Conflict
Software of the load controller too old
Replace basic unit