Specifications

TroubleshootingGuide
8|Page
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5.2TROUBLESHOOTING‐GENERALPROBLEMS
ProceedtotheErrorCodessectionifanerrorcodeisidentified.Forothercommonproblemsthatdo
notinvolveanerrorcode,seeifthefollowingitemshelp:
 Thewaterisnothotenough.
 Thewateristoohot.
 Temperaturefluctuateswhenafixtureisopened. 

Unitdoesnotignitewhenwatergoesthroughit.
 Ittakesalongtimetogethotwateratthefixtures.
 Thefanmotorisstillspinningafteroperationhasstopped.
 Abnormalsoundscomefromtheunit.
 Lossofpressureatallsinkswhenthedishwasher
fills.
 Unithaspower,gas,andwaterbutdoesnotturnon.
 MultipleHeaterSetup
THEWATERISNOTHOTENOUGH
• Thesettemperaturemaybesettoolow.Thetemperaturecanbechangedwiththe
pushbuttonsonthePCBorbytheremotetemperaturecontroller,ifoneisinstalled.
• Checktheflowandtemperaturerightattheunitatthepressurereliefvalvewithahandheld
thermometer.Ifthe
flowrateandtemperaturearecorrectatthePRV,thentheproblem
resideselsewhereintheplumbingline.Thefollowingcouldbeplumbinglineproblems:
o Checkforcrossplumbingbetweencoldwaterlinesandhotwaterlines.Seethe
Proceduressection(p.22)forinstructions.
o Checktosee
thatacheckvalveisinstalledbetweenthepumpdischargeandthe
connectiontothecoldwatersupply.Inspectthecheckvalveforproperoperation.If
thereisn’toneinstalled,orifitismalfunctioning,coldwatermaybeback‐feedinginto
thesystem.
• Unitmaybehardwaterscaled.
Thescaleactsasaninsulatorpreventingtheheatexchanger
fromtransferringheattothewater.
• Theunitmaynotbereceivingenoughgas.
o Thegassupplyvalvemaynotbefullyopen.
o Thegaslinemaybesizedimproperly.
o Thegassupplypressuremaybe
toolow.Thismaybecausedbyamalfunctioninggas
supplyregulator,sochecktoseeifyourregulatorisworkingproperly.
• Double‐checkfora101errorcode.A101errorcodewillreducetheamountofgasinputinto
theheater.
• Outputtemperaturewillbeaffectedif
airflowisimpeded.Thiscouldincludeblockageinthe
ventingline,oraclogged/dirtyburnerfromcontaminatedintakeair.
THEWATERISTOOHOT
• Thesettemperaturemaybesettoohigh.Thetemperaturecanbechangedwithdipswitcheson
thePCBorbytheremotetemperaturecontroller,ifoneisinstalled.
• Theflowadjustmentvalvecouldbeobstructedduetohardwaterscaleordebris,causinglower
thanexpectedwaterflow.Verify
waterflowwithagraduatedcontainerorwiththeremote
temperaturecontroller,ifoneisinstalled.
• Theoutputthermistorcouldbecompromised.Thiscomponentmaybecheckedbyenteringthe
DiagnosticsModeonaremotecontroller,ifoneisinstalled.Turnpowerofftotheunit andrun
cold
waterthroughit;checktoseeiftheinletandoutlettemperaturesreadthesameonthe