Install Instructions

45 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
Remote
Green
LED
Malfunction
description
Diagnosis
031
One Time Incorrect DIPswitch
setting
• Check the DIPswitch settings on the PCB (Part #701).
101
Five Times 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.
111
Three Times 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).
121
Three Times 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).
311
Two Times Outlet thermistor
failure (110U
(T-KJr2U) / 310U
(T-K4U) models
only)
Heat exchanger
thermistor failure
(510U (T-D2U))
model only)
• Check for connection/breakage of wires and/or
debris on thermistor (Part #407, 408, 411, 715).
321
Two Times Inlet thermistor
failure
331
Two Times Outlet thermistor
failure
(510U (T-D2U))
model only)