State GTS-110-NI - Manual (Page 40)

Troubleshooting
40 │
Page
‐FAULT ANALYSIS OF ERROR CODES‐
110 (T‐KJr2) and
310 (T‐K4)
510
(T‐D2) Malfunction
description
Diagnosis
Red
LED
Remote Remote
One
Time
03 031 Incorrect
dipswitch setting
 Check the dipswitch settings on the PCB. (Part
#701)
Five
Times
10 101 Warning for the
“991” error code
 Check the gas type of the water heater.
 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 the altitude/elevation of area of where the
water heater installed.
 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.
Three
Times
11 111 Ignition failure
 Check if the Hi‐limit switch (Part #412) is properly
functioning.
 Check for connection/breakage of wires (Part #413,
708, 709, 710, 712), burn marks on the computer
board (Part #701), and/or soot on the flame rod (Part
#108).
 Check if there is a buzzing spark ignition sound
coming from the burner (Part #101) when water
heater prepares for combustion.
 Listen for the double “clunk” sound coming from
gas valve assembly (Part #102) when water heater
goes into combustion.
 Check if there is leaking from heat exchanger. (Part
#401)
Three
Times
12 121 Loss of flame
 Check if the Hi‐limit switch (Part #412) is properly
functioning.
 Check for connection/breakage of wires (Part #413, 708,
709, 710, 712), burn marks on the computer board (Part
#701), and/or soot on the flame rod (Part #108).
 Check if there is leaking from heat exchanger. (Part
#401)
Two
Times
31 311
Output thermistor
failure
 Check for connection/breakage of wires and/or
debris on thermistor. (Part #407, 408, 411, 716)
32 321
Inlet thermistor
failure
N/A N/A 331
Mixing thermistor
failure
Two
Times
39 391 Air –fuel Ratio
Rod failure  Check for connection/breakage of wires (Part
#709) and/or soot on the AFR rod. (Part #108)
If the error code displayed on the computer board of the Water heater or remote controller,
please check the following. After checking, Consult with the manufacturer.