Manual
Troubleshooting
41│Page
T‐KJr2‐IN/OS
&T‐K4‐IN/OS
T‐D2‐
IN/OS
Malfunction
description
Diagnosis
Red
LED
RE02 RE30
N/A N/A 441
FlowSensor
Failure(Easy‐Link
Systemonly)
• Check for co nnection/breakage of wires and/or debris
ontheflowsensorimpeller.(Part#402,717)
Six
Times
51 510
AbnormalGas
SolenoidValve
• Check for connection/breakage of wires (Part #708)
and/orburnmarksonthecomputerboard(Part#701).
Six
Times
55 N/A
AbnormalMain
GasValve
• Checkforconnect ion/breakageofwires(Part#708)
and/orburnmarksonthecomputerboard(Part#701).
Four
Times
61 611
FanMotorFault
• Checkforconnect ion/breakageofwires,dustbuildupin
thefanmotor(Part#103)and/orburnmarksonthe
computerboard(Part#701).
• Checkforfrozen/corrosionofconnectors(Part#103).
N/A N/A 651
Flowadjustment
ValveFault
(Easy‐Link
Systemonly)
• Inspect the flow adjustment valve (Part #402), for
connection/breakageofwires(Part#718),lockedmotor
driveduetoscalebuildup,and/orwaterleakage.
One
Time
70 701
Computerboard
Fault
• Check for connection/breakage of wires (Part #714)
and/orburnmarksonthecomputerboard(Part#701).
• Checkthepowersupplyofthewaterheater.
Six
Times
72 721
FalseFlame
Detection
•
Forindoormodels,checkifcondensatedrainisinstalled
ontheventcollarofthewaterheater.
• Checkifthereisleakingfromheatexchanger(Part
#401).
N/A 74 741
Miscommunication
betweenWater
heaterandremote
controller
•
Checkthemodeltypeoftheremotecontroller.
•
Inspect the connections between the water heater and
remotecontroller.
•
Checkthepowersupply ofthewaterheater.
N/A N/A
761
Miscommunication
inEasy‐Linksy stem
• Check if the connections between the parent unit and
thechildunitsarecorrect.Refertop.24to27.
Five
Times
99 991
Imperfect
combustion
•
Checkthegastypeofthewaterheater.
• Inspecttheenvironmentaroundthewaterheater.
Determinehowlongtheunithasbeeninstalled.
• Checkthealtitude/elevationoftheareaofwherethe
waterheaterinstalled.
• Checkifthereisanyblockageintheintakeairand/or
exhaust.
•
Ifthewaterheaterisinstalledasadirect‐ventsystem,
checkwhetherthereisenoughdistancebetweenthe
intakeairterminalandtheexhaustterminal.
• Checkifthereisgreaseand/ordirtintheburner(Part#
101)andthefanmotor(Part#104),especiallyifthe
waterheaterhasbeeninstalledinacontaminatedarea.