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Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
Error Code
Malfunction description
Cancellation method
111
Error code is shown
after three failed
attempts at ignition
Ignition failure
Turn off the power or water supply
Diagnosis
Check point
1 Check gas supply and inlet gas pressure
(Refer to section 1)
2 Check the igniter
(Refer to section 10-19)
Visual inspection: connection/breakage of wires and/or
observed weak spark.
[1] Cracks/soot on igniter rod
[2] Improper gap between burner & igniter rod
Normal gap: 0.16" (4mm)
[3] PCB fault
Normal: 108 to 132 VAC at #7 (purple-purple) (during ignition)
B
3 PCB fault
[1] No voltage to main gas solenoid valve (MV)
Normal: 93 to 120 VDC between COM (blue) & #3 (light blue)
(during operation)
[2] No voltage to gas solenoid valve (SV
2
)
Normal: 93 to 120 VDC between COM (blue) & #53 (orange)
(during operation)
[3] No voltage to gas proportional valve (VG
0
)
Normal: 1.0 to 15 VDC between white & red (during operation)
C
H1
4 Gas solenoid valve fault
[1] Main gas solenoid valve (MV) fault
Normal: 1.35 to 1.65 kΩ between COM (blue) & #3 (light blue)
[2] Gas solenoid valve (SV
2
) fault
Normal: 1.35 to 1.65 kΩ between COM (blue) & #53 (orange)
[3] Gas proportional valve (VG
0
) fault
Normal: 1.0 to 15 VDC between white & red (during operation)
C
H1
5 Disconnected/damaged O.H.C.F.
(Refer to section 10-16)
Visual inspection: connection/breakage of wires.
Normal: 1.0 Ω or less between blue & blue
C2
6 Disconnected/damaged hi-limit switch.
(Refer to section 10-14)
Visual inspection: connection/breakage of wires.
Normal: 1.0 Ω or less between blue & blue
C1
7 Inspect flame rod
[1] Check for any soot on the rod.
[2] Check the connection of ground wire; make sure there is firm
contact to the ground of the water heater.
(in this case, the wire is contacted to the manifold surface.)
[3] PCB fault
During operation: more than 1 μA through the flame rod
wire (orange)
[4] Flame rod fault
During operation: more than 1 μA through the flame rod
wire (orange)
I
8 Check if hi-limit switch is properly functioning.