Goodman *CSS920402BN, Installation Instructions Manual

Page: 43 / 48

43
T
ROUBLESHOOTING
C
HART
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
•Circulator blower runs
continuously. No
furnace operation.
•Integrated control
module diagnostic LED
is flashing FOUR (4)
flashes.
•Primary or
auxiliary limit
circuit is
open.
•Check primary/
auxiliary limit. Replace
if necessary.
•Check filters and
ductwork for blockage.
Clean filters or remove
obstruction.
•Check circulator
blower speed and
performance. Correct
speed or replace blower
if necessary.
•Tighten or correct
wiring connection.
•Turn power OFF prior
to repair.
•Replace primary/
auxiliary limit with
proper replacement
part.
•Replace blower with
correct replacement
part.
4
4 FLASHES
•Faulty pirmary or
auxiliary limit switch.
•Insufficient condi-
tioned air over the
heat exchanger.
Blocked filters,
restrictive
ductwork, improper
circulator blower
speed, or failed
circulator blower.
•Loose or improperly
connected wiring.
Fault
Description(s)
Possible Causes Corrective Action
Cautions and
Notes
Symptoms of Abnormal
Operation
Associated
LED Code
2
•Normal furnace
operation.
•Integrated control
module diagnostic LED
is flashing SEVEN (7)
flashes.
•Flame sense
microamp
signal is low.
•Sand flame sensor.
•Inspect for proper
sensor alignment.
•Compare current gas
pressure to rating
plate info. Adjust as
needed.
•Turn power OFF prior to
repair.
•Clean flame sensor with
steel wool.
•See “Vent/Flue Pipe”
section for piping
details.
•See rating plate for
proper gas pressure.
7
7 FLASHES
•Flame sensor is
coated/oxidized.
•Flame sensor incor-
rectly positioned in
burner flame.
•Lazy burner flame due
to improper gas
pressure or combus-
tion air.
•Induced draft blower
and circulation blower
runs continuously. No
furnace operation.
•Integrated control
module diagnostic LED
is flashing FIVE (5)
flashes .
•Flame sensed
with no call for
heat.
•Correct short at
flame sensor or in
flame sensor wiring.
•Turn power OFF
prior to repair.
5
5 FLASHES
•Short to ground in flame
sense circuit.
•Furnace fails to
operate.
•Integrated control
module diagnostic LED
is flashing SIX (6)
flashes.
•No furnace operation.
•Rollout limit
open.
•Integrated
control module
fuse is blown.
•Check burners for
proper alignment.
•Check flue and air inlet
piping for blockage,
proper length, elbows,
and termination.
Correct as necessary.
•Check rollout limit.
Replace if necessary.
•Check induced draft
blower for proper
performance. Replace,
if necessary.
•Tighten or correct
wiring connection.
•Turn power OFF prior to
repair.
•See “Vent/Flue Pipe”
section for piping details.
•Replace induced draft
blower with correct
replacement part.
•Replace integrated control
module fuse with 3A
automotive fuse.
•Read precautions in
“Electrostatic Discharge”
section of manual.
•Replace rollout limit with
correct replacement part.
6
6 FLASHES
•Flame rollout.
•Misaligned burners,
blocked flue and/or
air inlet pipe, or
failed induced draft
blower.
•Loose or improperly
connected wiring.
•Short in 24 volt AC
control circuits or
safety circuits.
•Faulty rollout limit.
•Furnace fails to operate.
•Integrated control module
diagnostic LED is flashing
continuously .
•Polarity of
115 or 24
volt power is
reversed.
•Review wiring diagram to
correct polarity.
•Reverse orange and gray
wires going to trans-
former.
•Verify proper ground.
Correct if necessary.
•Turn power OFF
prior to repair.
C
•Polarity of 115 volt AC power
to furnace or integrated
control module is reversed.
•Orange and gray wires to
transformer are reversed.
•Poor unit ground.
CONTINUOUS/
7
8 FLASHES
8
•Furnace not operating.
•Integrated control
module diagnostic LED
is flashing EIGHT (8)
flashes.
•Problem with
igniter
circuit.
•Improperly connected
igniter.
•Bad igniter.
•Poor unit ground.
•Poor burner ground.
•Faulty integrated
control module.
•Check and correct wiring
from integrated control
module to igniter.
•Replace bad igniter.
•Check & correct unit
ground wire.
•Replace bad integrated
control module.
•Turn power OFF prior to
repair.
•Replace igniter w/
proper replacment part.
•Read precautions in
“Electrostatic Dis-
charge” section of
manual.
RAPID FLASH
•LED is steady on.
STEADY ON
•Normal operation.