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Page
-Fault Analysis of Error Codes-
If the error code is displayed on the computer board of the water heater or remote controller, please
check the following. After checking,
consult with the manufacturer
.
Troubleshooting
Owner's Guide
110 (T-KJr2) and
310 (T-K4)
510
(T-D2)
Malfunction
description
Diagnosis
Red
LED
Remote Remote
7 Seg LED
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 is 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
•
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).
Three
Times
12
121
Loss of flame
•
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).
Two
Times
31
311
Outlet
thermistor
failure
•
Check for connection/breakage of wires and/or debris on
thermistor (Part #407, 408, 411, 716).
Two
Times
32
321
Inlet thermistor
failure
N/A
N/A
331
Mixing thermis-
tor failure