State GTS-110-NI - Manual (Page 41)

Troubleshooting
41 │
Page
110 (T‐KJr2)
and 310 (T‐K4)
510
(T‐D2) Malfunction
description
Diagnosis
Red
LED
Remote Remote
N/A N/A 441
Flow Sensor
Failure
(Easy‐Link
System only)
 Check for connection/breakage of wires and/or debris
on the flow sensor impeller. (Part #402, 717)
Six
Times
51 510
Abnormal Gas
Solenoid Valve  Check for connection/breakage of wires (Part #708)
and/or burn marks on the computer board (Part
#701).
Six
Times
55 N/A Abnormal Main
Gas Valve
 Check for connection/breakage of wires (Part #708)
and/or burn marks on the computer board (Part
#701).
Four
Times
61 611 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).
N/A N/A 651
Flow
adjustment
Valve Fault
(Easy‐Link
System only)
 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
 Check for connection/breakage 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
 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).
N/A 74 741
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.
N/A N/A 761 Miscommunication in
Easy‐Link system
 Check if the connections between the parent unit and
the child units are correct. Refer to p.24 to 27.
Five
Times
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.