Goodman GMS9 Installation Instructions Manual page 35

Associated
Symptoms of Abnormal
Operation
LED Code
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control
4 FLASHES
module diagnostic LED
is flashing FOUR (4)
flashes.
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control
5 FLASHES
module diagnostic LED
is flashing FIVE (5)
flashes.
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control
6 FLASHES
module diagnostic LED
is flashing SIX (6)
flashes.
• Normal furnace
operation.
• Integrated control
module diagnostic LED
7 FLASHES
is flashing SEVEN (7)
flashes.
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing continuously.
CONTINUOUS/
RAPID FLASH
TR TR OUBLESH OUBLESH
TR TR TROUBLESH OUBLESH OUBLESHOO
Fault Description(s)
2
• Primary or auxiliary
limit circuit is open.
4
• Flame sensed with
no call for heat.
5
• Rollout limit circuit is
open.
6
• Flame sense
microamp signal is
7
low.
• Polarity of 115 or 24
C volt power is
reversed.
OO OO TIN TIN G CHAR G CHART T T T T G CHAR
OO OOTIN TIN TING CHAR G CHAR
Possible Causes
• 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.
• 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.
35
Corrective Action Cautions and Notes
• Check filters and • Turn power OFF
ductwork for blockage. prior to repair.
Clean filters or remove
• Replace pressure
obstruction.
switch with proper
• Check circulator blower replacement part.
speed and perfor-
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.
Correct as necessary.
• Ensure the correct
• Check induced draft
blower for proper pressure switch
replacement is
performance. Re-
used.
place, if necessary.
• Tighten or correct
wiring connection.
• Sand flame sensor is • 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.