Takagi T-KJr2-IN User Manual

Troubleshooting
40│Page
-FAULT ANALYSIS OF ERROR CODES-
110 (T-KJr2) and
310 (T-K4)
510
(T-D2)
Malfunction
description
Diagnosis
Red
LED
Remote
Remote
One
Time
03 031
Incorrect
dipswitch setting
 Check the dipswitch settings on the PCB. (Part
#701)
Five
Times
10 101
Warning for the
“991” error code

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.
Three
Times
11 111
Ignition failure

C
heck i
f 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.

Che
ck if there is leaking from h
eat exchanger. (Part #401
)
Three
Times
12 121
Loss of flame

Check i
f 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).

Ch
eck if there is leaking from h
eat exchanger. (Part #401
)
Two
Times
31 311
Output thermistor
failure
 Check for connection/breakage of wires and/or
debris on thermistor. (Part #407, 408, 411, 716)
32 321
Inlet
thermistor
failure
N/A N/A 331
Mixing
therm
istor
failure
Two
Times
39 391
Air –fuel Ratio
Rod failure
 Check for connection/breakage of wires (Part
#709) and/or soot on the AFR rod. (Part #108)
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.

Takagi T-KJr2-IN Specifications

General

Brand	Takagi
Model	T-KJr2-IN
Category	Water Heater
Language	English