Manual
Troubleshooting
40│Page
‐FAULTANALYSISOFERRORCODES‐
T‐KJr2‐IN/OS
&T‐K4‐IN/OS
T‐D2‐
IN/OS
Malfunction
description
Diagnosis
Red
LED
RE02 RE30
One
Time
03 031
Incorrect
dipswitchsetting
• CheckthedipswitchsettingsonthePCB.(Part#701)
Five
Times
10 101
Warningforthe
“991”errorcode
•
Checkthegastypeofthewaterheater.
• Checkifthereisanyblockageintheintakeairand/or
exhaust.
• Ifthewaterheaterisinstalledasadirect‐ventsystem,
checkwhetherthereisenoughdistancebetweenthe
intakeairterminalandtheexhaustterminal.
• Checkthe
altitude/elevationofareaofwherethe
waterheaterinstalled.
•
Checkifthereisgreaseand/ordirtintheburner(Part
#101)andthefanmotor(Part#103),especiallyifthe
waterheaterhasbeeninstalledinacontaminated area.
Three
Times
11 111
Ignitionfailure
•
CheckiftheHi‐limitswitch(Part#412)isproperly
functioning.
• Checkforconnect ion/breakageofwires(Part#413,
708,709,710,712),burnmarksonthecomputerboard
(Part#701),and/orsootontheflamerod(Part#108).
• Checkifthereisabuzzingsparkigni tionsoundcoming
from
theburner(Part#10 1 )whenwaterheater
preparesforcombustion.
• Listenforthedouble“clunk”soundcomingfromgas
valveassembly(Part#102)whenwaterheatergoes
intocombustion.
• Checkifthereisleakingfromheatexchanger.(Part
#401)
Three
Times
12 121
Lossofflame
•
CheckiftheHi‐limitswitch(Part#412)isproperly
functioning.
• Checkforconnect ion/breakageofwires(Part#413,
708,709,710,712),burnmarksonthecomputerboard
(Part#701),and/orsootontheflamerod(Part#108).
• Checkifthereisleakingfromheatexchanger.(Part
#401)
Two
Times
31 311
Output
thermistor
failure
• Check for connection/breakage of wires and/or debris
onthermistor.(Part#407,408,411,716)
32 321
Inletthermistor
failure
N/A N/A 331
Mixing
thermistor
failure
Two
Times
39 391
Air–fuelRatio
Rodfailure
• Check for connection/breakage of wires (Part #709)
and/orsootontheAFRrod.(Part#108)
IftheerrorcodedisplayedonthecomputerboardoftheWaterheaterorremotecontroller,
pleasecheckthefollowing.Afterchecking,Consultwiththemanufacturer.