Troubleshooting
41│Page
110 (T-KJr2)
and 310 (T-K4)
Malfunction
description
Diagnosis
Red
LED
Remote
N/A N/A 441
Flow Sensor
Failure
(Easy-L
System only)
Check for connection/breakage of wires and/or debris
on the flow sensor impeller. (Part #402, 717)
Six
Times
ion/breakage of wires (Part #708
and/or burn marks on the computer board (Part
55 N/A
Abnormal Main
Gas Valve
ion/breakage of wires (Part #708
and/or burn marks on the computer board (Part
in the fan motor (Part #103) and/or burn marks on the
computer board (Part #701).
Check for frozen/corrosion of connectors
adjustment
Valve Fault
(Easy-Link
Inspect the flow adjustment valve (Part #402), for
connection/breakage of wires (Part #718), locked
motor drive due to scale buildup, and/or water
leakage.
One
Time
70 701
Computer board
Fault
reakage of wires (Part #714
and/or burn marks on the computer board (Part
#701).
Check the power supply of the water heater.
Six
Times
72 721
False Flame
Detection
installed on the vent collar of the water heater.
Check if there is leaking from heat exchanger (Part
between Water
heater and remote
Check the model type of the remote controller.
Inspect the connections between the water heater
and remote controller.
eck the power supply of the water heater.
Check if the connections betwe
units are correct. Refer to p.24 to 27.
99 991
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 of where the
water heater 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 # 104), especially if the
water heater has been installed in a contaminated
area.