Takagi 110U Indoor (T-KJr2U-IN) Installation Manual And Owner's Manual page 46

Green
Remote
LED
391
Two Times
441
Two Times
510
Six Times
551
Six Times
611 Four Times
651
Four Times
661
Four Times
701
One Time
711
One Time
721
Six Times
741
N/A
761
N/A
991 Five Times
Malfunction
description
Air-fuel ratio rod • Check for connection/breakage of wires (Part #709)
failure
and/or soot on the AFR rod (Part #108).
Flow sensor failure • Check for connection/breakage of wires and/or
(Easy-Link System debris on the flow sensor impeller (Part #402).
only)
Abnormal main gas • Check for connection/breakage of wires (Part #708)
solenoid valve and/or burn marks on the computer board (Part
#701).
Abnormal gas • Check for connection/breakage of wires (Part #708)
solenoid valve and/or burn marks on the computer board (Part
#701).
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).
Flow adjustment • Inspect the flow adjustment valve (Part #402), for
valve fault (Easy- connection/breakage of wires, locked motor drive
Link System only) due to scale buildup, and/or water leakage.
Bypass valve fault • Inspect the bypass valve (Part #403), for connection/
(510U (T-D2U))
breakage of wires, locked motor drive due to scale
models only)
buildup, and/or water leakage.
Computer board fault • Check for connection/breakage of wires (Part #714).
Gas solenoid valve • Refer to the 111 and 121 error codes.
drive circuit failure
False flame • For indoor models, check if condensate drain is
detection installed on the vent collar of the water heater.
• Check if there is leaking from heat exchanger (Part
#401).
Miscommunication • Check the model type of the remote controller.
between water • Inspect the connections between the water heater
heater and remote and remote controller.
controller • Check the power supply of the water heater.
Miscommunication • Check if the connections between the parent unit
in Easy-Link system and the child units are correct. Refer to p. 25-28.
Imperfect • Check the gas type of the water heater.
combustion • Inspect the environment around the water heater.
Determine how long the unit has been installed.
• 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.
46
Page
Owner's Guide
Troubleshooting
Diagnosis