User Guide

44 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.
Troubleshoong
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