Siemens LMV5 Series Technical Instructions page 239

Error Diag.
Device Display
Code Code
Fault with devices or wiring connected to the Base Unit (LMV5)
Any #
Extraneous Light
23 00
on Startup
LMV5 /
01
Flame
03
Detect.
Any #
Extraneous Light
00
24
on Shutdown
01
03
Any #
No Flame at End
00
25
of Safety Time
01
LMV5 /
03
Flame
Detect.
Any #
00
26 Loss of Flame
01
03
27 Any # Air Pressure on Air pressure = on, but should have been off
Devices
Any #
conn. to
00
28 Air Pressure off
LMV5
01
Section 7
Meaning for the LMV5x System
Basic unit has detected extraneous light during startup
Basic unit has detected extraneous light during startup
01 = QRI / QRB, 02 = ION / UV, 03 = any (LMV52 only)
Basic unit has detected extraneous light during shutdown
Basic unit has detected extraneous light during shutdown
01 = QRI / QRB, 02 = ION / UV, 03 = any (LMV52 only)
No flame detected at the end of safety time TSA1 or TSA2.
No flame detected at the end of safety time TSA1 or TSA2
01 = QRI / QRB, 02 = ION / UV, 03 = any (LMV52 only)
Loss of flame during normal operation (phase 60-62)
(LMV52 only) Loss of flame during normal operation
01 = QRI / QRB, 02 = ION / UV, 03 = any (LMV52 only)
Air pressure = off, but should have been on
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Corrective Action
1) Ensure that the source of extraneous light is not a
flame. If it is a flame, take corrective action
immediately.
2) If the QRI scanner is used, ambient light can cause
an extraneous light error. Ensure sensor is viewing a
dark area such as the inside of a boiler.
3) If the QRI scanner is used, check for glowing
refractory. If glowing refractor is the cause, the
afterburn time may need to be lengthened or a UV
scanner may have to be used.
1) With a piloted gas train, this means that the pliot did
not light. Check wiring of ignition transformer and pilot
valve.
2) Check manual shutoff valves for the pilot gas.
3) Check position of air damper. Close further if
necessary. Pilot may be blowing out.
4) Check flame detector for signal in the presence of
flame using a flame source. Replace if detector does
not generate the anticipated signal.
1) Check flame detector for signal in the presence of
flame using a flame source. Replace if detector does
not generate the anticipated signal.
2) Check for flame signal "decay" as burner refractory
heats up. If this happens, a UV scanner may be
needed.
3) Increase setting of ReacTmeLossFlame .
1) Make sure blower starts in phase 22 and shuts off in
phase 78 or 83 (see sequence diagrams).
2) Check the setpoint on the air pressure switch. Raise
setpoint if necessary. Switch should open after
postpurge.
The error message may be traced back to an open
safety loop / burner flange.
SCC Inc.