Siemens LMV5 Series Basic Documentation page 227

Error Diagnostic Device
code code
A9 1F FuM
AB # O2M
AB 01 O2M
AB 02 O2M
AB 04 O2M
AB 05 O2M
AB 07 O2M
AB 08 O2M
AB 09 O2M
AB 0A O2M
AB 10 O2M
AB 12 O2M
AB 13 O2M
AB 15 O2M
AB 16 O2M
AB 17 O2M
AB 18 O2M
AB 19 O2M
AB 1A O2M
Siemens Building Technologies Basic Documentation LMV51...
HVAC Products 15 Addendum 1: List of fault status messages of LMV51... system
Display
Internal Fault VSD Module Internal plausibility fault. This type of fault
detects faults that cannot practically
occur...
Fault O2 Module The O2 module has detected own fault
and reported it to the basic unit
Internal Fault O2 Module CRC fault during ROM test
Internal Fault O2 Module CRC fault during RAM test
Internal Fault O2 Module Fault during key value check
Internal Fault O2 Module Error code for time block overflow
Internal Fault O2 Module Sync fault or CRC fault
Internal Fault O2 Module Error code for main loop counter
Internal Fault O2 Module Fault during stack test
Internal Fault O2 Module Feedback values invalid
Unplaus Value Nernst Voltage Nernst voltage outside the valid range
O2 Module
Unplaus Value Thermocouple Thermocouple voltage outside the valid
O2 Module range
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
Meaning for the LMV5x system Troubleshooting
*1)
*2)
*2)
*2)
*2)
*2)
*2)
*2)
*2)
Check the connection (correct polarity, short-circuit)
Check connections (polarity, short-circuit, open-circuit).
Check power supply to the O2 module.
Check fuse F2 on the O2 module.
Check heating control on the QGO.
Check connections (polarity, short-circuit, open-circuit).
Check housing temperature of the QGO (temperature inside
-25°C..120°C)
Check connections (short-circuit, open-circuit).
Check ambient temperature
Check connections (short-circuit, open-circuit).
Check ambient temperature
*2)
*2)
*2)
*2)
227/278
CC1P7550en
01.10.2003