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Inducer Draft Motor
and
Pressure Switch
Check
Is induced
draft motor
energized?
YES
YESNO
Is diagnostic
LED flashing 3
times?
Call for heat.
Thermostat
contacts
R & W close.
Jumper
pressure
switch.
Disconnect
electric power
at fuse or
circuit breaker.
Is pressure
switch welded
closed?
Correct blocked
or incorrectly
installed vent.
Check operation.
Repair leaks in
inducer assembly or
replace induced
draft motor. Check
operation.
Check inducer
wiring. If OK,
repair or replace
inducer motor.
Check operation.
Replace pressure
switch. Energize
system. Check
operation.
NO
YES
NO
NO
3A 3F
Is diagnostic
LED flashing 2
times?
3B
3C
3D
3G
3H
3E
3I
3J
3L
YES
NO
Is
pressure
greater than
pressure switch
specs?
YES
Replace pressure
switch. Check
operation.
NO
Is
pressure
greater than
pressure switch
specs?
YES
YES
NO
Does ignitor
glow?
Test for
continuity across
pressure switch.
Place incline
manometer in
series with
pressure switch
tubing.
Remove vent
connector
from furnace
flue collar.
3K
CHART 3
WARNING
!
If diagnostic indicator (LED)
shows continuous ashing, turn
off gas supply at source before
disconnecting electrical power!
INTEGRATED FURNACE
CONTROL MODULE
TROUBLESHOOTING
GUIDE
www.white-rodgers.com
192
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