Specifications

TroubleshootingGuide
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4|Page
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2.INTRODUCTION
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Thismanualprovidesthenecessaryinformation fortroubleshootingthe520(T‐H2)and320(T‐H2S)
tanklesswaterheaters.Thismanualwillbeeffectiveinhelpingyo ur troubleshootingneedsaslongas
theinstructionsarefollowedintheintendedorder.Hereishowtousethismanual:
• Firstreferto
the520(T‐H2)and320(T‐H2S)InstallationManualastheprimarysourceof
information.Refertoitalongsidethismanualthroughoutthetroubleshootingprocess.
• Beforetroubleshooting,ifyouareunfamiliarwithhowatanklessunitoperates,readtheNormal
Operationsection(p.5).
• Todouble‐check/troubleshootanewinstallation,usetheProperInstallationsection(p.6).
• Whenbeginningtroublesh ooting,firstgothroughthePreliminaryChecklist(p.8);itisdesigned
tofixthemostcommonandfrequentproblems,andprovideyouwithbackgroundinformation
tohelpnarrowdowntheinformationyouneed.
• AfterthePreliminaryChecklist,movetotheErrorCo dessection(p.13)ifyouhavereceivedan
errorcode,ortoGeneralProblems(p.9)ifyouhavenotreceivedanerrorcode.
Ifyouhaveanyproblemsorquestionsregardingthisequipment,oratanypointbecomeconfusedor
uncomfortablewith
anyoftheprocedures, consultwiththetechnicalservicedepartmentorthelocal
serviceagent.
IMPORTANT
• Installationandservicemustbeperformedbyaqualifiedinstaller(for
example,alicensed plumberorgasfitter).Otherwisethewarrantywill
bevoid.
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• Theinstaller/serviceagent(licensedprofessional)isresponsiblefor
correctlyinstallingorservicingyourwaterheaterandforcompliance
withallnational,state/provincial,andlocalcodes.
*ForallunitsinstalledinthestateofMassachusetts,itisrequiredthattheinstallereitherbea
licensedplumberorlicensedgasfitter.
GENERALINSTALLATIONGUIDELINES
1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the
NationalFuelGasCode:ANSIZ223.1/NFPA54intheUSAorCAN/CSAB149.1NaturalGas,Propane
InstallationCodeinCanada.
2. Properlygroundthe unitinaccordancewith alllocalcodesorin
theabsenceoflocal codes,with
the National Elec tricalCodes:ANSI/NFPA 70in the USA or CSA standard C22.1Canada Electrical
CodePart1inCanada.
3. Carefullyplanwhereyouintendtoinstallyourwaterheater.
4. ChecktheratingplateforthecorrectGASTYPE,GASPRESSURE,WATER
PRESSURE
andELECTRICRATING.
*Ifthisunitdoesnotmatchyourrequir ements,donotinstall.
5. Ifanyproblemshouldoccur,turnoffallhotwatertapsandturnoffthe
gas.Thencallatrainedtechnicianorthegascompan y.
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WARNING
RATINGPLATE
Figure1