Takagi T-KJr2-IN Installation Manual And Owner's Manual page 40

If the error code displayed on the computer board of the Water heater or remote controller,
please check the following. After checking, Consult with the manufacturer.
510
110 (T-KJr2) and
310 (T-K4)
(T-D2)
Red
Remote Remote
LED
One
03 031
Time
Five 10 101
Times
Three 11 111
Times
Three 12 121
Times
Two
31 311
Times
32 321
N/A N/A 331
Two
39 391
Times
-FAULT ANALYSIS OF ERROR CODES-
Malfunction
description
Incorrect
dipswitch setting
Warning for the
"991" error code
Ignition failure
Loss of flame
Output thermistor
failure
Inlet thermistor
failure
Mixing thermistor
failure
Air –fuel Ratio
Rod failure
40
Diagnosis
Check the dipswitch settings on the PCB. (Part
#701)
Check the gas type of the water heater.
Check if there is any blockage in the intake air
and/or exhaust.
If the water heater is installed as a direct-vent
system, check whether there is enough distance
between the intake air terminal and the exhaust
terminal.
Check the altitude/elevation of area of where the
water heater installed.
Check if there is grease and/or dirt in the burner (Part
#101) and the fan motor (Part #103), especially if the
water heater has been installed in a contaminated area.
Check if the Hi-limit switch (Part #412) is properly
functioning.
Check for connection/breakage of wires (Part #413,
708, 709, 710, 712), burn marks on the computer
board (Part #701), and/or soot on the flame rod (Part
#108).
Check if there is a buzzing spark ignition sound
coming from the burner (Part #101) when water
heater prepares for combustion.
Listen for the double "clunk" sound coming from
gas valve assembly (Part #102) when water heater
goes into combustion.
Check if there is leaking from heat exchanger. (Part #401)
Check if the Hi-limit switch (Part #412) is properly
functioning.
Check for connection/breakage of wires (Part #413, 708,
709, 710, 712), burn marks on the computer board (Part
#701), and/or soot on the flame rod (Part #108).
Check if there is leaking from heat exchanger. (Part #401)
Check for connection/breakage of wires and/or
debris on thermistor. (Part #407, 408, 411, 716)
Check for connection/breakage of wires (Part
#709) and/or soot on the AFR rod. (Part #108)
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Page
Troubleshooting