Error Codes; Troubleshooting - Takagi T-KJr Installation Manual And Owner's Manual

Common Trouble Shooting
The T-KJR can burn gas at a maximum input
rate of 140,000 BTUH. This puts a limit on the
possible output
capabilities. If the water doesn't seem hot
enough, compare the flow and temperature
that is being attained to the T-KJR flow vs.
temperature chart (See flow chart on the last
page of this manual). If the unit is not
performing according to the chart, first check
that the gas supply pipe is sized properly and
that the gas pressure is within the required
range. If the gas line is sized properly, check
the plumbing for mixing valves, thermostatic
valves, anti-scald devices, single handled
faucets with built in temperature or pressure
compensators valves and hot and cold crossed
connections. If the unit is performing in
accordance with the flow chart, it may be
undersized for the application. If the unit is
performing according to the chart, the output
temperature can be adjusted using the TK-
RE02 or the dipswitches on the unit.
It Takes Too Long to Get Hot Water
The T-KJR takes three seconds to ignite and
three more seconds to heat the incoming
ground water up to the set temperature. The
time it takes to deliver hot water from the T-
KJR to your fixtures depends on the length of
piping between the two.
distance, the more time it will take.
would like to receive hot water to your fixtures
quicker, you may want to consider a hot water
recirculation system.
Computer Board
Blinking One Time
Blinking Two Times
Blinking Three Times
Blinking Four Times
temperature and
The longer the
If you
The T-KJR Will Not Initiate
First check the flow rate through the unit. If the
flow is less than .75 GPM, the unit will not
initiate. Check the filter for any debris or
flow
damage. If you have installed a combination
system (a T-KJR doing both domestic hot
water and space heating), completely isolate
the heating system temporarily to ensure flow
is not backfeeding through your heating
system to supply the domestic water (by-
passing the T-KJR).
If neither of those remedies start the unit, press
the lower grey button marked "test (off)" on the
GFCI inside the unit. If the red light above it
does not come on, there is a problem with the
electrical supply to the unit. If that red light
does come on, hit the "reset (on)" button and
open a hot water faucet to re-try the unit. If the
problem persists contact Takagi for instructions
All Takagi units are self diagnostic for safety
and convenience when trouble shooting. If
there is a problem with the installation or the
unit, it will display a numerical error code on
the TK-RE02 (if installed) or at the bottom left
corner of the computer board to communicate
the source of the problem. Consult the
following chart for the cause of an error code:
The T-KJR consists of five major control
operations: Temperature control, Gas control,
Water control, Burner Control, and Main
computer control
TK-RE02
03
70
71
31
32
11
12
55
51
72
6 1
21
17

ERROR CODES

.
Check Point
Wrong Gas
Computer Board
Solenoid Gas Valve
Output Thermistor
Input Thermistor
Hi-limit, Igniter
Flame Sensor, Hi-limit
Main Gas Valve
Proportional Gas Valve
Abnormal Burning
F a n
Pressure switch