A.O. Smith 710 ASME Service Manual page 43

Error Code
Pump failure
631
1 Check whether the pump connected to PCB works properly.
Error Code
Water control valve fault
(Flow adjustment function)
651
(Only Easy-link and Multi-unit system)
1 PCB and flow adjustment valve fault
(Refer to section 10-9 & 10-14)
V isual inspection of Water control valve: connection / breakage of wires,
motor drive locked due to scale buildup, and/or water leakage.
Normal: 13.0 to 16 VDC between (blue-brown)
Normal: ON:12.5 to 16.0 VDC / OFF: 0 to 1 V
Normal: 1 V Less than (0˚ position)
V isual inspection PCB: connection / breakage of wires and/or burn marks on
the computer board.
Error Code
Water control valve fault
(Bypass valve function)
661
1 PCB and bypass valve fault
(Refer to section 10-9 & 10-14)
V isual inspection of Water control valve: connection / breakage of wires,
motor drive locked due to scale buildup, and/or water leakage.
Normal: 13.0 to 16 VDC between (blue-brown)
Normal: ON:12.5 to 16.0 VDC / OFF: 0 to 1 V
Normal: 1 V Less than (0˚ position)
V isual inspection PCB: connection/ breakage of wires and/or burn marks on
the computer board.
Malfunction description
Malfunction description
Malfunction description
710 / 710 ASME Service Manual
Turn off the power
Diagnosis
Turn off the power or water supply
Diagnosis
Turn off the power or water supply
Diagnosis
43
CONFIDENTIAL
Ver. 1.00
Cancellation method
Checkpoint
Cancellation method
Checkpoint
Cancellation method
Checkpoint
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