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240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
Error Code
Malfunction description
Cancellation method
651
Flow adjustment valve fault
(Only Easy-link system)
Turn off the power or water supply
Diagnosis
Check point
1 PCB and flow adjustment valve fault
(Refer to section 10-9 & 10-18)
Visual inspection of flow adjustment valve: connection/breakage of
wires, motor drive locked due to scale buildup, and/or
water leakage.
Normal: 7.0 to 16 VDC between (black-red)
Visual inspection PCB: connection/breakage of wires and/or burn
marks on the computer board.
J
Error Code
Malfunction description
Cancellation method
661
Bypass valve fault (Only 540 (T-H3) models)
Turn off the power or water supply
Diagnosis
Check point
1 PCB and bypass valve fault
(Refer to section 10-11 & 10-18)
Visual inspection of bypass valve: connection/breakage of wires,
motor drive locked due to scale buildup, and/or water leakage.
Normal: 3.0 to 11 VDC between (brown-red)
Visual inspection PCB: connection/breakage of wires and/or burn
marks on the computer board.
J1
Error Code
Malfunction description
Cancellation method
611
Fan motor fault
Turn off the power or water supply
Diagnosis
Check point
1 PCB and fan motor fault
(Refer to section 10-3 & 10-18)
Visual inspection of fan motor: connection/breakage of wires or
dust buildup (causing electrical shortage)
Normal: 132 to 192 VDC between red & blue (during operation)
Normal: 13 to 17 VDC between yellow & blue (during operation)
Normal: 2.0 to 6.5 VDC between orange & blue (during operation)
Verify fan motor speed of the water heater using the "diagnostics
mode" of the controller.
(Refer to section 12-1)
Visual inspection of PCB: connection/breakage of wires and/or
burn marks on the computer board.
G