Siemens LMV52.440B1 - Flame Failure - Error Code 25 or 26

TechnicalInstructions  LMVSeries
DocumentNo.LV5‐1000
Section7 Page8 SCCInc.
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FlameFailure–ErrorCode25or26
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Ifeitheranerrorcode25orerrorcode26isencountered,aflamefailurehasoccurred.An
errorcode25meansthataflamefailureoccurredduringpilot,whileanerrorcode26means
thataflamefailureoccurredduringoperation.Toremedyeitherfault,checkthefollowing:
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1. Increasetheflamefailureresponsetimethroughthefollowingmenupath:
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Params&Display>BurnerControl>Configuration>ConfigFlameDet>ReacTmeLossFlame
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TheLMV5hasabaseflamefailureresponsetimeof0.8seconds.Thesettingofparameter
ReacTmeLossFlameadds
anadditional0.2–3.2secondsforamaximumofa4second
flamefailureresponsetime(FFRT).
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2. Useaflamesourcetocheckiftheflamescannerisdefective.Theflamesignalcanbe
viewedusingthefollowingmenupath:
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Params&Display>BurnerControl>Configurati
on>ConfigFlameDet>FlameSignal
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ParameterFlameSigQRI_Bcanbeusedtoviewtheflamesignalwhenusinganinfrared
scanner(QRI2…)oranultravioletscanner(QRA7…).ParameterFlameSigIONcanbeused
toviewtheflamesignalwhenusingaflamerod.Aflamefailureoccursbelowa20%flame
signal.Iftheflamesignalreads0%whenusingaflamesource,checkthewiringofthe
scanner.SeeSection2forwiringassistance.Ifthewiringiscorrect,replacethedefective
scanner.
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3. Ifanerrorcode25occurred,checkthewiringoftheignitiontransformerandpilotvalve.
Also,checktomakesureanymanualshutoffvalvesareopenonthepilotline.
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4. Ifanerrorcode25occurred,checkthepositionoftheairdamperduringignition.Thiscan
beviewedusingthefollowingmenupath:
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Params&Display>RatioControl>GasSettings>SpecialPosit
ions>IgnitionPos>
IgnitionPosAir
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Decreasethispositionifthepilotflameisbeingblownout.
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5. Ifanerrorcode26occurred,therecouldbeflamesignaldecayduetoglowingrefractory
insidetheboiler.Ifthisisthecase,replacetheQRI2…infraredscannerwithaQRA7…
ultravioletscanner.
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