A.O. Smith 240 T-H3J Service Manual page 54

Error Code
611
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)
burn marks on the computer board.
Error Code
651
(Refer to section 10-9 & 10-18)
water leakage.
Normal: 7.0 to 16 VDC between (black-red)
marks on the computer board.
Error Code
661
(Refer to section 10-11 & 10-18)
Normal: 3.0 to 11 VDC between (brown-red)
marks on the computer board.
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Malfunction description
Diagnosis
(Refer to section 10-3 & 10-18)
(Refer to section 12-1)
Malfunction description
Diagnosis
Malfunction description
Diagnosis
54
Page
CONFIDENTIAL
Ver. 1.00
Cancellation method
Check point
G
Cancellation method
Check point
J
Cancellation method
Check point
J1