Goodman GMV95 Installation Instructions Manual page 38

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
circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FIVE (5) flashes.
• Normal furnace operation.
• Integrated control module
diagnostic LED is flashing
SEVEN (7) flashes.
• Furnace not operating.
• Integrated control module
diagnostic LED is flashing
EIGHT (8) flashes.
8 FLASHES
• Furnace operating on
low stage gas with high
stage induced draft blower
• High stage circulator
9 FLASHES
blower (temperature, of
conditioned air, lower than
typical).
• Integrated control module
diagnostic LED is flashing
NINE (9) flashes.
• Furnace fails to operate.
• Integrated control module
diagnostic LED is flashing
continuously.
CONTINUOUS
TROUBLESHO 18OTING CHART
Associated
Fault Description(s)
2
LED Code
• Primary or auxiliary
limit circuit is open.
4
4 FLASHES
• Rollout limit circuit is
open.
• Flame sensed with
5
no call for heat.
5 FLASHES
• Flame sense
microamp signal is
low.
7
7 FLASHES
• Problem with
igniter circuit.
8
• High stage pressure
switch circuit does not
9
close in response to
high stage induced
draft blower operation.
• Polarity of 115 volt
power is reversed.
C
FLASHING
Possible Causes
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed, or
failed circulator blower.
• Flame rollout.
• Misaligned burners, blocked
flue and/or air inlet pipe, or
failed induced draft blower.
• Loose or improperly
connected wiring.
• Short to ground in flame
sense circuit.
• Lingering burner flame.
• Slow closing gas valve
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• Improperly connected
igniter
• Bad igniter
• Poor unit ground
• Pressure switch hose blocked,
pinched or connected
improperly.
• Blocked flue and/or inlet air
pipe, blocked drain system, or
weak induced draft blower.
• Incorrect pressure switch
setpoint or malfunctioning
switch contacts.
• Loose or improperly connected
wiring.
• Polarity of 115 volt AC
power to furnace or
integrated control module is
reversed.
• Poor unit ground.
38
Corrective Action Cautions and Notes
• Check filters and • Turn power OFF
ductwork for blockage.
Clean filters or remove
obstruction.
• See Product Data
• Check circulator blower
speed and performance.
Correct speed or replace
blower if necessary.
• Check burners for proper
alignment.
• See "Vent/Flue
• Check flue and air inlet
piping for blockage,
proper length, elbows,
and termination. Correct
as necessary.
• Replace pressure
• Check induced draft
blower for proper
performance. Replace, if
necessary.
• Tighten or correct wiring
connection.
• Correct short at flame
• Turn power OFF
sensor or in flame
sensor wiring.
• Check for lingering
flame
• Verify proper operation
of gas valve
• Sand flame sensor is
• Turn power OFF
coated/oxidized.
• Inspect for proper sensor
• Sand flame
alignment.
• Check inlet air piping for
blockage, proper length,
• See "Vent/Flue
elbows, and termination.
• Compare current gas
pressure to rating plate
• See rating plate
info. Adjust as needed.
• Check and correct wiring • Turn power OFF
from integrated control
prior to repair.
module to igniter
• Replace igniter
• Replace bad igniter
with proper
replacement part.
• Check and correct unit
ground wiring
• Inspect pressure switch hose. • Turn power OFF
Repair, if necessary.
• Inspect flue and/or inlet air
• Replace pressure
piping for blockage, proper
length, elbows, and termina-
tion. Check drain system.
Correct as necessary.
• Correct pressure switch
setpoint or contact motion.
• Tighten or correct wiring
connection.
• Review wiring diagram to
• Turn power OFF
correct polarity.
• Verify proper ground.
Correct if necessary.
• Check and correct wiring.
prior to repair.
Book applicable
to your model* for
allowable rise
range and proper
circulator speed.
Pipe" section for
piping details.
switch with proper
replacement part.
prior to repair.
prior to repair.
sensor with
emery clot.
Pipe" section for
piping details.
for proper gas
pressure.
prior to repair.
switch with proper
replacement part.
prior to repair.