Siemens LMV5 Series Technical Instructions page 209

LMV Series
7-1: Troubleshooting Introduction
The LMV5 has an extensive list of fault codes to help clarify the nature of any fault. Section 7-3
describes what every fault code is and gives some guidance on how to correct it.
The most common issues seen on the LMV5 are described in greater detail in Section 7-2 to
offer additional troubleshooting help. The issues covered in Section 7-2 are:
CANbus Faults Including "AZL not on Bus" and "System Test" . ...................................................... 2
Fault Positioning Actuator - Error Code 15 .................................................................................... 6
Internal Fault Actuator - Error Code 19 ......................................................................................... 7
Flame Failure - Error Code 25 or 26 ............................................................................................... 8
Open Circuit / Short Circuit Sensor Faults - Error Code A6 (Diagnostics 50...5A) . ......................... 9
Open Safety Loop - Error Code 21 ............................................................................................... 10
LMV5 Will Not Start (Stays in Phase 12) ....................................................................................... 11
LMV5 Will Not Modulate Properly ............................................................................................... 12
O Sensor is Not Reading .............................................................................................................. 13
2
O Sensor Reading Grossly High or Low . ....................................................................................... 14
2
O Sensor Reads But Responds Very Slowly ................................................................................. 14
2
Ambient or Stack Temperature Sensor Reading Incorrectly ........................................................ 15
AZL says "O2 Module not active or not Available" ....................................................................... 15
AZL Says "O2 Setpoint must lie 0.1% below O2 Ratio Control" or "O2 Setpoint must lie 0.1%
above O2 Min" ........................................................................................................................ 16
AZL Says "Measurement not Successful" When Measuring the Delay Time for O
AZL Says "O2 Trim Control Automatically Deactivated" . .............................................................. 18
VSD Will Not Operate.................................................................................................................... 19
Unsuccessful VSD Standardization ............................................................................................... 20
AZL Says "Fan Speed Not Reached" or "Control Range Limitation VSD Module" ........................ 22
SCC Inc.
General
O2 Trim
Variable Speed Drive (VSD)
Page 1
HOME
Technical Instructions
Document No. LV5-1000
Trim . ............ 17
2
Section 7