Siemens LMV5 Quick Start Manual page 168

Error Diag.
Device Display
code code
07
08 Internal Fault O2
Module
09
0A
Unplaus Value
10 Nernst Voltage
O2 Module
Unplaus Value
12 Thermocouple O2
Module
Unplaus Value
13 Compensation
Element
Unplaus Value
15
Flue Gas Temp
O2 Module
Unplaus Value
AB PLL5..
16 Flue Gas Temp
O2 Module
17
18
Internal Fault O2
19
Module
1A
1B
O2 Sensor Temp
20
too low
O2 Sensor Temp
21
too high
Internal Fault O2
22
Module
LMV5 QSG Rev 4
Meaning for the LMV5x system
Fault with 02 Module (PLL5..) or Oxygen Sensor (QGO2..)
Sync fault or CRC fault
Error code for main loop counter
Fault during stack test
Feedback values invalid
Nernst voltage outside the valid range
Thermocouple voltage outside the valid range
Compensation element voltage outside the valid range
Temperature of combustion air sensor outside the valid range (-
20...+400 °C)
Temperature of flue gas sensor outside the valid range (-
20...+400 °C)
Fault during combustion air temperature sensor test
Fault during thermocouple test
Fault during compensation element test
Fault during channel comparison of O2 signal
Fault ADC test voltages
Temperature of QGO measuring cell too low
Temperature of QGO measuring cell too high
Fault during calculation test
Sec 5 Pg 42
Corrective action
1) If fault occurs sporadically: Improve EMC.
2) If fault occurs constantly: Replace PLL5..
1) Check the wiring between the O2 Module and the O2
sensor. Ensure high and low voltage are in seperate
conduits.
2) Check the power supply to the O2 Module
3) Check fuse in the O2 Module
4) Check the heating control on the O2 Sensor
5) Check the temperature inside the O2 Sensor terminal
box. Should be between -13 and 248
5) If fault occurs constantly, Replace O2 Sensor and / or
Module.
1) Check the wiring between the O2 Module and the O2
sensor.
2) Check the ambient / Flue gas temperature. Compare
to valid range.
1) Check the wiring between the O2 Module and the O2
sensor.
2) If fault occurs constantly, Replace O2 Sensor and / or
Module
1) Check the temperature of heated sensor (can be
viewed on AZL) Minimum operating termperature is
1202 F, Maximum 1382 F. If the O2 sensor could take
up to 20 minutes to reach temperature.
2) Ensure O2 sensor is installed properly (see section 2)
and that stack gas velocity is correct. Min =3.2 ft / sec
Max = 32 ft/ sec.
3) Check the power supply to the O2 Module
4) Check fuse in the O2 Module
If fault occurs constantly, Replace O2 Sensor and / or
Module
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