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Page
-Fault analysis-
If the error code is displayed on the computer board of the water heater or remote controller and/or
temperature controller, please check the following. After checking,
consult with the manufacturer
.
Troubleshooting
Owner's Guide
Remote Green
LED
Malfunction
description
Diagnosis
031
One
Time
Incorrect DIP
switch setting
•
Check the DIP switch 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, 711), 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 functioning properly.
•
Check for connection/breakage of wires (Part #413, 708, 709, 711),
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
Heat exchanger
thermistor failure
•
Check for connection/breakage of wires and/or debris on thermis-
tor (Part #407, 408, 411, 715, 718, 731).
321
Two
Times
Inlet thermistor
failure
331
Two
Times
Outlet thermistor
failure
341
Two
Times
Exhaust
thermistor failure
(Indoor model
only)
351
Two
Times
Return Thermistor
Failure
391
Two
Times
Air-fuel ratio rod
failure
•
Check for connection/breakage of wires (Part #709) and/or soot on
the AFR rod (Part #108).
441
Two
Times
Flow sensor
failure
•
Check for connection/breakage of wires and/or debris on the flow
sensor impeller (Part #402).
510
Six
Times
Abnormal main
gas solenoid valve
•
Check for connection/breakage of wires (Part #708) and/or burn marks
on the computer board (Part #701).
551
Six
Times
Abnormal gas
solenoid valve
•
Check for connection/breakage of wires (Part #708) and/or burn marks
on the computer board (Part #701).
