Goodman GKS9 Installation Instructions Manual page 37

T C
ROUBLESHOOTING HART
Symptoms of Abnormal
Operation
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control
module diagnostic LED
is flashing FOUR (4)
flashes.
• Induced draft blower and
circulation blower runs
continuously. No furnace
operation.
• Integrated control
module diagnostic LED
is flashing FIVE (5)
flashes.
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control
module diagnostic LED
is flashing SIX (6)
flashes.
• Normal furnace
operation.
• Integrated control
module diagnostic LED
is flashing SEVEN (7)
flashes.
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing continuously.
1
Integrated control module will automatically attempt to reset from lockout after one hour.
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
Associated
Fault Description(s)
2
LED Code
• Primary or auxiliary
limit circuit is open.
4
4 FLASHES
• Flame sensed with
5 no call for heat.
5 FLASHES
• Rollout limit circuit is
open.
6
6 FLASHES
• Flame sense
microamp signal is
7
low.
7 FLASHES
• Polarity of 115 or 24
volt power is
C
reversed.
CONTINUOUS/
RAPID FLASH
Possible Causes
• Faulty primary or auxiliary
limit switch.
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed, or
failed circulator blower.
• Loose or improperly
connected wiring.
• Short to ground in flame
sense circuit.
• Flame rollout.
• Misaligned burners, blocked
flue and/or air inlet pipe, or
failed induced draft blower.
• Loose or improperly
connected wiring.
• Faulty rollout limit.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• 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.
37
Corrective Action Cautions and Notes
• Check primary/auxiliary • Turn power OFF
limit. Replace if prior to repair.
necessary.
• Replace primary/
• Check filters and auxiliary limit with
ductwork for blockage. proper replacement
Clean filters or remove part.
obstruction.
• Replace blower
• Check circulator blower with correct
speed and perfor- replacement part.
mance. Correct speed
or replace blower if
necessary.
• Tighten or correct
wiring connection.
• Correct short at flame • Turn power OFF
sensor or in flame prior to repair.
sensor wiring.
• Check burners for • Turn power OFF
proper alignment. prior to repair.
• Check flue and air inlet • See "Vent/Flue
piping for blockage, Pipe" section for
proper length, elbows, piping details.
and termination.
• Replace rollout
Correct as necessary.
limit with correct
• Check rollout limit.
replacement part.
Replace if necessary.
• Replace induced
• Check induced draft
draft blower with
blower for proper
correct replace-
performance. Re-
ment part.
place, if necessary.
• Tighten or correct
wiring connection.
• Sand flame sensor if • Turn power OFF
coated/oxidized. prior to repair.
• Inspect for proper • Sand flame sensor
sensor alignment. with emery clot.
• Check inlet air piping • See "Vent/Flue
for blockage, proper Pipe" section for
length, elbows, and piping details.
termination.
• Compare current gas • See rating plate for
pressure to rating plate proper gas
info. Adjust as pressure.
needed.
• Review wiring diagram • Turn power OFF
to correct polarity. prior to repair.
• Reverse orange and
gray wires going to
transformer.
• Verify proper ground.
Correct if necessary.