Siemens LMV51 Series - Page 244

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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
AB 13 O2M Unplaus Value Compensation
Element
Compensation element voltage outside
the valid range
Check connections (polarity, short-circuit, open-circuit).
Check housing temperature of the QGO (temperature inside
-25...120 °C)
AB 15 O2M Unplaus Value Flue Gas Temp
O2 Module
Temperature of combustion air sensor
outside the valid range (-20...+400 °C)
Check connections (short-circuit, open-circuit).
Check ambient temperature
AB 16 O2M Unplaus Value Flue Gas Temp
O2 Module
Temperature of flue gas sensor outside
the valid range (-20...+400 °C)
Check connections (short-circuit, open-circuit).
Check ambient temperature
AB 17 O2M Internal Fault O2 Module Fault during combustion air temperature
sensor test
*2)
AB 18 O2M Internal Fault O2 Module Fault during thermocouple test *2)
AB 19 O2M Internal Fault O2 Module Fault during compensation element test *2)
AB 1A O2M Internal Fault O2 Module Fault during channel comparison of O2
signal
*2)
AB 1B O2M Internal Fault O2 Module Fault ADC test voltages *2)
AB 20 O2M O2 Sensor Temp too low Temperature of QGO measuring cell too
low
Check mains power supply on O2 module.
Check fuse F2 on O2 module.
Check connection between O2 module and QGO heating
AB 21 O2M O2 Sensor Temp too high Temperature of QGO measuring cell too
high
Check QGO temperature
AB 22 O2M Internal Fault O2 Module Fault during calculation test *2)
AB 23 O2M Unplaus Value Ri 02 Measuring
Cell
Measured internal resistance of the QGO
measuring cell is smaller than 5 Ohm or
greater than 150 Ohm
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
AB 24 O2M Response Time O2 Measuring
Cell too long
Measured response time of the QGO
measuring cell exceeds 5 s
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
AB 25 O2M O2 Sensor Test aborted by O2
Module
Fault occurred during O2 sensor test Check fluctuations of the O2 value
AB 30 O2M Internal Fault O2 Module CAN fault *2)