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INTEGRATED FURNACE
CONTROL MODULE
Cooling
Cycle
Check
temperature selection
2C
Does
indoor blower
YES
energize at
Y connected to furnace
heating fan
speed?
NO
2G
Is 24V
present across
YES
control terminals
Y & C?
NO
2I
Is 24V
present at
NO
control terminals
R & C?
YES
Repair low
voltage wiring to
from transformer to
thermostat.
Check operation.
CHART 2
2A
Place thermostat
system switch in
cooling mode and fan
Does indoor
switch in AUTO
blower energize
position. Lower
lever to call for a
cooling cycle. R & Y
contacts close.
2E
2D
Is
switch closed,
thermostat terminal
YES
jumper control
terminal Y?
NO
Correct wiring
from thermostat
terminal Y to Y on
furnace. Check
operation.
2J
2K
Is 24V
Is 120V present
NO
present at
at primary of
control terminals
transformer?
G & C?
YES
2L
control terminals
LINE & LINE
Repair low
Correct 120V
voltage wiring
power supply to
control. Check
control. Check
operation.
operation.
www.white-rodgers.com
TROUBLESHOOTING
2B
Return thermostat
YES
to desired
at cooling
setting.
fan speed?
NO
2F
With door
Does
indoor blower
energize at
cooling fan
terminals
R & Y.
speed?
2H
Is 120V
present at
control terminals
COOL & CIR
NEUTRAL?
YES
NO
Is 120V
present at
YES
NEUTRAL?
NO
If diagnostic indicator (LED)
shows continuous flashing, turn
off gas supply at source before
disconnecting electrical power!
GUIDE
Repair low
YES
voltage wiring to
thermostat. Check
operation.
NO
Indoor blower
YES
fault. Repair or
replace motor.
Check operation.
NO
Replace control.
Check operation.
Replace
transformer.
Check operation.
Repair wiring
between control and
transformer
primary. Check
operation.
WARNING
!
191
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