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Remote
LED
391*
Two Times
510
Six Times
551
Six Times
611*
Four Times
701*
One Time
711*
One Time
721*
Six Times
741
N/A
751
N/A
941
Five Times
991
Five Times
*
These error code will be clear when water flow stops.
Malfunction
description
Air-fuel ratio rod
• Check for connection/breakage of wires (Part #708)
failure
and/or soot on the AFR rod (Part #108).
Abnormal main gas
• Check for connection/breakage of wires (Part #707)
solenoid valve
and/or burn marks on the computer board (Part #701).
• Check for signs of vent corrosion.
• Check gas valve contacts and gas valve wire harness
connections for signs of rust or corrosion.
Abnormal gas
• Check for connection/breakage of wires (Part #707)
and/or burn marks on the computer board (Part #701).
solenoid valve
• Check gas valve contacts and gas valve wire harness
connections for signs of rust or corrosion..
Fan motor fault
• Check for connection/breakage of wires, dust buildup
in the fan motor (Part #103) and/or burn marks on
the computer board (Part #701).
• Check for frozen/corrosion of connectors (Part #103).
Computer board fault • Check for connection/breakage of wires (Part #711).
Gas solenoid valve
• Refer to the 111 and 121 error codes.
drive circuit failure
False flame
• Check if there is leaking from heat exchanger (Part #401).
detection
Miscommunication
• Check the model type of the remote controller.
between the water
• Inspect the connections between the water heater
heater and remote
and remote controller.
controller
• Check the power supply of the water heater.
Miscommunication
• Inspect the connections between the water heater
between the water
and temperature controller.
heater and built-in
• Check the power supply of the water heater.
controller
(Indoor
model only)
Abnormal exhaust
• Check to see of the exhaust temperature is higher
temperature
than 149°F (65°C).
(Indoor
model only)
Imperfect
• Check if the gas type of the water heater matches
the gas supplied to it.
combustion
• Inspect the environment around the water heater.
Determine how long the water heater has been
installed and match DIPswitches.
• Check the altitude/elevation of the area of where
the water heater is installed.
• 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 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 the water
heater.
• Check the manifold pressure at Max. and Min.
• Check combustion chamber tube (part #117) to see
if it is clear and securely installed.
49
Page
Owner's Guide
Troubleshooting
Diagnosis
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