Fan Motor - A.O. Smith T-H3J-DV Service Manual

10-3. Fan motor

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
The connector
The fan motor for indoor model has the red
connector and the fan motor for outdoor
model has the white connector.
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
• 319143-443 (EK109) : Direct Vent Indoor model
• 319143-043 (EKK25) : Outdoor model
To provide combustion air into the combustion 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 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.
101 111
1. Visual inspection: connection/breakage of wires or dust (causing electrical
shortage)
2. Voltage check: proper range of voltages shown below.
Blue - Red 132 to 192 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
White - Blue Diagnostics Mode of the controller.
See Section 12-1 for details.
PWN turbo fan motor
24
Page
CONFIDENTIAL
Unit Part#
121 611
Check
point
Opening 2-1/8" ( 54 mm)
Ver. 1.00
#103
991
G