A.O. Smith 110 Indoor Service Manual page 42

Error Code
Fan motor fault
61
1 PCB and fan motor fault
V isual inspection of fan motor: connection/breakage of wires or dust
buildup (causing electrical shortage)
Normal: 110 to 160 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 9007666005 temperature remote controller. See the "12-1. How to
diagnose the water heater using the 9007666005."
V isual inspection of PCB: connection/breakage of wires and/or burn marks
on the computer board.
Error Code
1 PCB fault
[1] Fault of preparation for the outlet thermistor
70
operation
[2] Fault of driving circuit for Gas Proportional
Valve(VG
1 Check the PCB and/or gas proportional valve
(Refer to section 10-4 & 10-14)
V isual inspection PCB: connection/breakage of wires and/or burn marks on
the computer board.
V isual inspection gas proportional valve: connection/breakage of wires of
the gas proportional valve.
Normal: 20 to 40 Ω between (white) & (red)
Error Code
False flame detection
72
1 False flame detection (5 sec.)
Flame rod (Insulated resistance) fault
Malfunction description
(Refer to section 10-3 & 10-14)
Malfunction description
)
0
Malfunction description
110 Indoor / 110 Outdoor Service Manual
Turn off the power or water supply
Diagnosis
Turn off the power or water supply
Diagnosis
Turn off the power or water supply
Diagnosis
42
CONFIDENTIAL
Ver. 1.01
Cancellation method
Checkpoint
Cancellation method
Checkpoint
Cancellation method
Checkpoint
G
H1
I