Siemens LMV5 Series Basic Documentation page 228

Error Diagnostic Device
code code
AB 1B O2M
AB 20 O2M
AB 21 O2M
AB 22 O2M
AB 23 O2M
AB 24 O2M
AB 25 O2M
AB 30 O2M
AB 31 O2M
AB 32 O2M
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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 O2 Module Fault ADC test voltages
O2 Sensor Temp too low Temperature of QGO measuring cell too
low
O2 Sensor Temp too high Temperature of QGO measuring cell too
high
Internal Fault O2 Module Fault during calculation test
Unplaus Value Ri 02 Measuring Measured internal resistance of the QGO
Cell measuring cell is smaller than 5 Ohm or
greater than 150 Ohm
Response Time O2 Measuring Measured response time of the QGO
Cell too long measuring cell exceeds 5 s
O2 Sensor Test aborted by O2 Fault occurred during O2 sensor test
Module
Internal Fault O2 Module CAN fault
Internal Fault O2 Module CRC fault of a parameter page
Internal Fault O2 Module Page too long open
Meaning for the LMV5x system Troubleshooting
*2)
Check mains power supply on O2 module.
Check fuse F2 on O2 module.
Check connection between O2 module and QGO heating
Check QGO temperature
*2)
Check electrical connection (polarity, short-circuit).
If fault occurs after more than 1 year, QGO may have
reached the end of its service life -> replace
Check mounting position of QGO.
Check to see if QGO is dirty.
If error occurs after more than 1 year, QGO may have
reached end of its service life -> replace
Check fluctuations of the O2 value
*2)
Reset the unit.
! Caution ! If fault occurred during parameterization: Check
the parameters changed last.
If fault cannot be rectified by the reset: Restore AZL5...
parameters.
Otherwise, replace defective O2 module
Reset the unit.
! Caution ! If fault occurred during parameterization: Check
the parameters changed last.
If fault cannot be rectified by the reset: Restore AZL5...
parameters.
Otherwise, replace defective O2 module
CC1P7550en
01.10.2003