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-Fault Analysis of Error Codes-
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 matches the
gas supplied to it.
•
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 and match DIP switch.
•
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.
•
Check the DIP switches match gas type of unit.
•
Check the manifold pressure at Max. and Min.
•
Check proportional gas valve hose.
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 the water
heater prepares for combustion.
•
Listen for the double “clunk” sound coming from gas
valve assembly (Part #102) when the water heater
goes into combustion.
•
Check if there is leaking from heat exchanger (Part #401)
•
Check that the gas is turned on.
•
Check gas supply.
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).
•
Check gas supply.
