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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
24 01/02/03 BU Extraneous Light on Shutdown (LMV52...) Basic unit has detected extra-
neous light during startup phase.
Bit-by-bit coding:
Bit 0 = flame QRI.../QRB... present
Bit 1 = flame ION present
25 --- BU No Flame at End of Safety Time No flame detected at the end of safety time
TSA1
25 00 BU No Flame at End of Safety Time No flame detected at the end of safety time
TSA1
25 01/02/03 BU No Flame at End of Safety Time (LMV52...) No flame detected at the end of
the safety time.
Bit-by-bit coding:
Bit 0 = flame QRI.../QRB... present
Bit 1 = flame ION present
26 --- BU Loss of Flame Detection of loss of flame during operation
26 00 BU Loss of Flame Loss of flame during operation detected
26 01/02/03 BU Loss of Flame (LMV52...) Loss of flame during operation
detected.
Bit-by-bit coding:
Bit 0 = flame ION present
27 --- BU Air Pressure on Air pressure = on, but should have been off
28 --- BU Air Pressure off Air pressure = off, but should have been on
29 --- BU Fan Contactor Contact is on FCC signal = on, but should have been off
2A --- BU Fan Contactor Contact is off FCC signal = off, but should have been on
2B --- BU Flue Gas Recirculation Pressure Switch
on
FGR-PS = on, but should have been on
2C --- BU Flue Gas Recirculation Pressure Switch
off
FGR-PS = off, but should have been on
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