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TROUBLESHOOTING
GUIDE
CHART 1
Indoor Blower
Check
1C
1D
Does LED
flash 1 time
YES
when disconnect
is turned
ON?
NO
1G
1H
Is 120V
present across
YES
control terminals
LINE & LINE
NEUTRAL?
NO
Correct 120V
power supply. Check
operation.
WARNING
!
If diagnostic indicator (LED)
shows continuous flashing, turn
off gas supply at source before
disconnecting electrical power!
190
1A
Place
thermostat
Does indoor
fan switch in
blower run at
the ON
HEAT speed?
position.
1E
Is 24V
present at
present at
YES
control
terminals
terminals
R & C?
NO
Replace control.
Check operation.
1I
NO
Is 120V
Is 120V
present at
present across
YES
control terminals
primary of control
XFMR & XFMR
transformer?
NEUTRAL?
Repair wiring to
transformer. Check
operation.
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INTEGRATED FURNACE
1B
Return fan
YES
switch to
AUTO position.
NO
1F
Is 120V
Is 24V
present at
YES
control terminals
control
COOL & CIR
NEUTRAL?
G & C?
NO
NO
1J
Is 24V
present across
YES
secondary of
transformer?
NO
NO
Replace
transformer. Check
operation.
CONTROL MODULE
Indoor blower
YES
fault. Repair or
replace. Check
operation.
Replace control.
Check operation.
Repair wiring
from control to
thermostat. Check
operation.
1K
Is 24V
present
YES
across 12-pin
connector pins TH
& TR on the
control?
NO
Repair wiring
and/or plug
connection. Check
operation.
YES
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