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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)