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43
Remote
LED
Green
Diagnosis
descrip
391
Two Times Air-fuel ra rod
failure
441
Two Times
• Check for c
reakage of wires (Part #709)
and/or soot on the AFR rod (Part #108).
Flow sensor failure
(Easy-Link System only)
510
Six Times Abnormal main gas
solenoid valve
• Check for c
reakage of wires and/or
debris on the flow sensor impeller (Part #402).
551
Six Times Abnormal gas
solenoid valve
• Check for connec
reakage of wires (Part #708)
and/or burn marks on the computer board (Part #701).
611
Four Times Fan motor fault
• Check for connec
reakage of wires (Part #708)
and/or burn marks on the computer board (Part #701).
651
Four Times Flow adjustment
valve fault (Easy-
Link System only)
• Check for c
reakage 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).
661
Four Times Bypass valve fault
701
One Time
• Inspect the flow adjustment valve (Part #402), for
c
reakage of wires, locked motor drive
due to scale buildup, and/or water leakage.
Computer board fault
711
One Time
• Inspect the bypass valve (Part #403), for c
breakage of wires, locked motor drive due to scale
buildup, and/or water leakage.
• Check for c
reakage of wires (Part #714).
721
Gas solenoid valve
drive circuit failure
Six Times
• Refer to the 111 and 121 error codes.
det
False flame
741
N/A Miscommunica
between micro-
boiler and remote
controller
• Check if condensate drain is installed on the vent
collar of the micro-boiler.
• Check if there is leaking from heat exchanger (Part #401).
751
N/A
• Check the model type of the remote controller.
• Inspect the c
between the micro-boiler
and remote controller.
• Check the power supply of the micro-boiler.
Miscommunica
between micro-boiler
and temperature
controller
761
N/A Miscommunica
in Easy-Link System
• Inspect the c
between the micro-boiler
and temperature controller.
• Check the power supply of the micro-boiler.
941
Five Times Abnormal exhaust
temperature
• Check if the c
between the parent unit
and the child units are correct.
991
Five Times Imperfect
combus
• Check if the set temperature is higher than 140°F
(60°C) and the system is Recircula
• Check the gas type of the micro-boiler.
• Inspect the environment around the micro-boiler.
Determine how long the unit has been installed.
• Check the eleva of the area of where
the micro-boiler is installed.
• Check if there is any blockage in the intake air and/
or exhaust.
• If the micro-boiler 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
micro-boiler has been installed in a contaminated area.
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