Fan Motor - A.O. Smith 110 Indoor Service Manual

10-3. Fan motor

Unit Part #
Function
Failure events
Effects on the water
heater if fan motor fails
Error codes when the fan
motor fails
Diagnostic
Color/Number of wires
PWN multi blade fan motor
#103 AOS Part #
To provide combustion air into the burner chamber and to exhaust flue gas.
1. Fan speed failure, causing abnormal sounds with or without combustion
during operation.
2. Unexpected activation caused by the connectors of the fan motor getting
wet.
3. Disconnects out from the bottom of the combustion chamber
1. The water heater does not function properly
2. Failure to ignite or abnormal ignition
3. Unstable combustion conditions
10 11
1. Visual inspection: connection/breakage of wires or dust (causing electrical
shortage)
2. Voltage check: proper range of voltages shown below.
Red-Blue 110 to 160 VDC (Input)
Yellow-Blue 13 to 17 VDC (Input)
Orange-Blue 2.0 to 6.5 VDC (Input)
Verify the fan motor speed using the Diagnostics Mode of
White-Blue
the 9007666005 temperature remote controller. See
Section 12-1 for details.
110 Indoor / 110 Outdoor Service Manual
319143-347
12
19
CONFIDENTIAL
Checkpoint
61 99
Fan damper (#115 / 319143-160)
The fan damper
is not included in
319143-347.
Ver. 1.01
G