A.O. Smith T-M50 ASME Specifications

TroubleshootingGuide1|Page910/910ASME(T‐M50/T‐M50ASME)On‐DemandWaterHeaterTroubleshootingGuide 

TroubleshootingGuide10|Pageo Seethatacheckvalveisinstalledbetweenthepumpdischargeandtheconnectiontothecoldwatersupply.Amalfu

TroubleshootingGuide11|PageEASY‐LINKSYSTEMSE TUP(MULTIPLEHEATERSETUP) • RefertotheInstallationManualforpropersetup.• UnitNumberi

TroubleshootingGuide12|Page5.3TROUBLESHOOTING‐ERRORCO DES• Alltanklessunitsareselfdiagnosticforsafetyandconveniencewhentroubles

TroubleshootingGuide13|PageERRORCODE031:INCORRECTDIPSWITCHSETTINGS1) Turnoffthepowersupply.2) Removefrontcoverandlocatethedi

TroubleshootingGuide14|Page3) Verifythatthegassupplypressureiswithinspecificationswhentheheaterisinstandbyandwhentheheaterisr

TroubleshootingGuide15|PageERRORCODE311:OUTPUTTHE RMISTOR1) Checkthatthewireconnectionsaresecureandfreeofburnsorcuts.Theout

TroubleshootingGuide16|PageERRORCODE391:AIR‐FUE LRATIORODFAILURE 1) Checkthatthewireconnectionsaresecureandfreeofburnsorcut

TroubleshootingGuide17|PageERRORCODE611:ABNORMALFANMOTOR1) Turnoffpowersupply.2) Checkfanmotorwiringforanybreakages,burnmar

TroubleshootingGuide18|PageERRORCODE661:BYPASSVAL VEFAULT1) Turnoffpowersupply.2) Checkthatallwireconnectionsaresecureandf

TroubleshootingGuide19|Page ERRORCODE761:COMMUNICATIONFAILURE1) Thiserrorcodeonlyoccursinamultipleheatersetup,wherethereis

TroubleshootingGuide2|PageTableofContents1. SPECIFICATIONS.……………………………………………………………………………..……………………32. INTRODUCTION

TroubleshootingGuide20|Page5.4TROUBLESHOOTING‐PROCEDURESVerifyingproperDipswitchsettings…p.20Drainingtheunit………………………………p.22Cleaningt

TroubleshootingGuide21|PageTable4–Dipswitches,CenterBoard,UPPERNo. Function ONposition OFFposition1 GasType Propane NaturalGas

TroubleshootingGuide22|Page4 ActivationofIndividualOperationmodeEnable(Default)Disable5 Directventsetting EnableDirectventmode

TroubleshootingGuide23|PageCHECKGA SSUPPLYPRESSURE:1) Closethemanualgasinletshutoffvalveonthegassupplyline.2) Openafaucet.

TroubleshootingGuide24|PageADJUSTINGMAN IFOLDPRESSURE: Themanifoldgaspressureofthetanklessunitcanbeadjustedbythefollowingprocedu

TroubleshootingGuide25|PageCHECKINGTHEOVERHEATCUTOFFFUSE(OH CF):1) LocatethewhiteOHCFwhichwrapsaroundtheheatexchanger.2) Find

TroubleshootingGuide26|Page6.MAINTENANCESafety is the most important part of this guide. These procedures must be done by a lic

TroubleshootingGuide27|PageCLEANINGTHECOMBUSTIONCOMPONENTSProcedureforcleaningthefan,burner,FlameSensorandAFR,asusedbyallServic

TroubleshootingGuide28|Page6) BURNERASSEMBLY‐Nowproceedtoremovetheburnerassembly.a. RemovethefivewidepanheadPhilipsscrewsh

TroubleshootingGuide29|Page7) CLEANTHEBURNER‐Useasafedegreaser.a. Protecttheburnergasketfromdirectwaterpressure.IFthegasketb

TroubleshootingGuide3|Page1.Table1‐SPECIFICATIONS UnitModel 910/910ASME(T‐M50/T‐M50ASME)Unitdimensions  H25.3"×W24.8"×D

TroubleshootingGuide30|Page11) SENSORS–a. CleantheflamesensorandAFRwithsandpaper,thoroughlytoabrightfinish.Itisimportantto

TroubleshootingGuide31|PageREPLACINGTHEHEATEXCHANGERTherearemanypossiblecausesofaheatexchangerfailure:• Contaminated air with 

TroubleshootingGuide32|Page5) WIRES‐Thereareseveralwireclipsthatneedtoberemovedtofreetheheatexchangera. Bluewiredclipstoth

TroubleshootingGuide33|Page7) WATERWAYSa. DRAINTHEUNITofwater.RefertotheDrainingtheUnitprocedureinthetroubleshooting procedu

TroubleshootingGuide34|Page9) REPLACETHEHEATEXCHANGERCOMPONENTSa. Removeandinspectthenewheatexchangermakingsureitisdesi gnedf

TroubleshootingGuide35|Page10) REASSEMBLE‐Reassembletheunitinreverseorder.Keypointstoremember:a. Allwiresmustbereconnected.K

IfthetankinitiatewthePCBo1) TOOLa. Db. #2c. Fld. O2) PREPAa. Db. D3) FRON4) COMPa. Rmthb. D5) DISCOa. Thb. R6) CHECKa. Citb. Bferec.

TroubleshootingGuide37|PageDESCALINGTHEUNITHardwaterisasevereproblemforthecoppercoilsinsideheatexchangers.Heatexchangerfailur

TroubleshootingGuide4|Page2.INTRODUCTIONThismanualprovidesthenecessaryinformation fortroubleshootingthe910/910ASME(T‐M50/T‐M50

TroubleshootingGuide5|Page3.NORMALOPERATIONThe910/910ASME(T‐M50/T‐M50ASME)isacombinationoftwotanklesswaterheatersinonecase,

TroubleshootingGuide6|Page4.INSTALLATION 1. Follow all local codes, or in the absence of local codes, follow the most recent ed

TroubleshootingGuide7|Page5.TROUBLESHOOTING5.1PRELIMINARYCHECKLISTCheckallofthesebasicitemsbeforeproceedingontoanyothersection:•

TroubleshootingGuide8|Page5.2TROUBLESHOOTING‐GENERALPROBLEMSProceedtotheErrorCodessectionifanerrorcodeisidentified.Forothercom

TroubleshootingGuide9|Pageremote.Forinstructionsonhowtodothis,refertotheMaintena nce Sheet,packagedwitheverytanklesswaterheater