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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
441
Flow sensor failure (Only Easy-link system)
Turn off the power or water supply
Diagnosis
Check point
1 Flow sensor fault
(Refer to section 10-10)
Visual inspection: connection/breakage of wires and/or debris on
impeller.
Check voltage/resistance between (red & black) or (white & black)
H2
Error Code
Malfunction description
Cancellation method
551
Fault of driving circuit for any of the gas solenoid
valves (SV
1
, SV
2
and/or SV
3
)
(The computer checks the condition of the
solenoid valves 6 hours after every operation)
Turn off the power supply
Diagnosis
Check point
1 PCB and/or gas valve fault
(Refer to section 10-4 & 10-18)
Visual inspection of gas valves: connection/breakage of wires.
Normal: 93 to 120 VDC between COM (blue) & #9 (green)
(during operation)
Normal: 93 to 120 VDC between COM (blue) & #53 (orange)
(during operation)
Normal: 93 to 120 VDC between COM (blue) & #73 (red)
(during operation)
Visual inspection of PCB: connection/breakage of wires and/or burn
marks on the computer board.
2 Gas solenoid valve fault (SV
1
, SV
2
and/or SV
3
)
C
Error Code
Malfunction description
Cancellation method
510
Fault of driving circuit for main gas solenoid valve
(MV)
(The computer checks the condition of the main
gas valve immediately after every operation)
Turn off the power supply
Diagnosis
Check point
1 PCB and/or main gas valve fault
(Refer to section 10-4 & 10-18)
Visual inspection of gas valves: connection/breakage of wires.
Normal: 93 to 120 VDC between COM (blue) & #3 (light blue)
(during operation)
Visual inspection of PCB: connection/breakage of wires and/or burn
marks on the computer board.
2 Main gas valve fault
C