61
Page
Troubleshooting
Owner's Guide
Controller Green
LED
Malfunction
description
Diagnosis
331*
Two
Flashes
Outlet thermistor fail-
ure (540H only)
• Check for connection/breakage of wires and/or debris on thermistor (Part
#407, 408, 411, 715, 718 721).
341*
Two
Flashes
Exhaust thermistor failure
(Indoor models only)
391*
Two
Flashes
Air-fuel ratio rod fail-
ure
• Check for connection/breakage of wires (Part #709) and/or soot on the AFR
rod (Part #108).
441
Two
Flashes
Flow sensor failure
(Easy-Link System only)
• Check for connection/breakage of wires and/or debris on the flow sensor
impeller (Part #402).
• Verify the shutoff valves on the hot and cold water line to the water heater
are open.
• Inspect the filter for blockage/debris. Refer to the procedure on p.51.
510
Six
Flashes
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
Flashes
Abnormal gas solenoid
valve
• Check for connection/breakage of wires (Part #708) and/or burn marks on the
computer board (Part #701).
611*
Four
Flashes
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).
651*
Four
Flashes
Flow adjustment valve
fault (Easy-Link System
only)
• Inspect the flow adjustment valve (Part #402), for connection/breakage of
wires, locked motor drive due to scale buildup, and/or water leakage.
661*
Four
Flashes
Bypass valve fault
(540H only)
• Inspect the bypass valve (Part #403), for connection/breakage of wires, locked
motor drive due to scale buildup, and/or water leakage.
701*
One
Flash
Computer board fault
• Check for connection/breakage of wires (Part #714).
711*
One
Flash
Gas solenoid valve
drive circuit failure
• Refer to the 111 and 121 error codes.
721*
Six
Flashes
False flame detection • For indoor models, check if condensate drain is installed on the vent collar of
the water heater.
• Check if there is leaking from heat exchanger (Part #401).
741
N/A
Miscommunication
between water heater
and remote controller
• Check the model type of the remote controller.
• Inspect the connections between the water heater and remote controller.
• Check the power supply of the water heater.
751
N/A
Miscommunication
between water heater
and built-in controller
(Indoor models only)
• Inspect the connections between the water heater and built-in controller.
• Check the power supply of the water heater.
761
N/A
Miscommunication in
Easy-Link System
• Check if the connections between the parent unit and the child units are cor-
rect. Refer to pp. 38 to 39.
• Check that power is on to all heaters.
941
Five
Flashes
Abnormal exhaust
temperature (Indoor
models only)
• Check if the set temperature is higher than
140 °F (60 °C) and the system is
Recirculation.
• Check for connection/breakage of wires, dust buildup in the fan motor (Part #103).
• Check for connection/breakage of wires of the hi-limit switch for exhaust (Part
#472, 721).
991
Five
Flashes
Imperfect
combustion
• Check the gas type of the water heater.
• Inspect the environment around the water heater. Determine how long the
unit has been installed.
• Check the altitude/elevation of the area 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.
*These error codes will be cleared when water flow stops.
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