Siemens LMV51 Series Basic Documentation page 244

Error Diagnostic Device
code code
AB 13 O2M
AB 15 O2M
AB 16 O2M
AB 17 O2M
AB 18 O2M
AB 19 O2M
AB 1A O2M
AB 1B O2M
AB 20 O2M
AB 21 O2M
AB 22 O2M
AB 23 O2M
AB 24 O2M
AB 25 O2M
AB 30 O2M
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Siemens Building Technologies Basic Documentation LMV5...
HVAC Products 16 Addendum 1: List of fault status messages of LMV5... system
Display
Unplaus Value Compensation Compensation element voltage outside
Element the valid range
Unplaus Value Flue Gas Temp Temperature of combustion air sensor
O2 Module outside the valid range (-20...+400 °C)
Unplaus Value Flue Gas Temp Temperature of flue gas sensor outside
O2 Module the valid range (-20...+400 °C)
Internal Fault O2 Module Fault during combustion air temperature
sensor test
Internal Fault O2 Module Fault during thermocouple test
Internal Fault O2 Module Fault during compensation element test
Internal Fault O2 Module Fault during channel comparison of O2
signal
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
Meaning for the LMV5x system Troubleshooting
Check connections (polarity, short-circuit, open-circuit).
Check housing temperature of the QGO (temperature inside
-25...120 °C)
Check connections (short-circuit, open-circuit).
Check ambient temperature
Check connections (short-circuit, open-circuit).
Check ambient temperature
*2)
*2)
*2)
*2)
*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)
CC1P7550en
13.08.2004