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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.
Green
Remote
LED
031
One Time
101
Five Times
111
Three Times Ignition failure
121
Three Times Loss of flame
-Fault Analysis of Error Codes-
Malfunction
description
Incorrect DIP switch
• Check the DIP switch settings on the PCB (Part #701).
setting
Warning for the
• Check the gas type of the water heater matches the
"991" error code
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.
• 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.
• 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.
50
Page
Owner's Guide
Troubleshooting
Diagnosis
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