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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
311
Two Times
321
Two Times
341
Two Times
-Fault Analysis of Error Codes-
Malfunction
description
Incorrect DIPswitch
• Check the DIPswitch settings on the PCB (Part #701)
setting
Warning for the
• Check if the gas type of the water heater matches
the gas supplied to it
"991" error code
• 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 the appropriate
DIPswitches
• 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 if the DIPswitches match gas type of the water
heater
• Check the manifold pressure at Max and Min
• Check combustion chamber tube (Part #117) to make
sure it is clear and securely installed
• Check if the Hi-limit switch (Part #411) is properly
functioning
• Check for connection/breakage of wires (Part #412, 707,
708, 709 710), 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 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 #411) is properly
functioning
• Check for connection/breakage of wires (Part #412,
707, 708, 710), 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
Outlet thermistor
failure
• Check for connection/breakage of wires and/or
Inlet thermistor
failure
debris on thermistor (Part #407, 408, 715)
Exhaust thermistor
• Check the resistance
failure (Indoor
model only)
46
Page
Owner's Guide
Troubleshooting
Diagnosis
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