Troubleshooting Chart - Goodman AMV8 Installation And Operating Instructions Manual

Symptoms of Abnormal
Operation
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FOUR (4) flashes.
• Integrated control module
diagnostic LED is flashing
FIVE (5) times.
• Induced draft blower and
circulator blower run
continuously. No furnace
operation.
• Furnace fails to operate.
• Integrated control module
diagnostic LED is flashing
continuously.
• 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.
• Furnace operating on
low stage gas with high
stage induced draft blower
• High stage circulator
blower (temperature, of
conditioned air, lower than
typical).
• Integrated control module
diagnostic LED is flashing
NINE (9) flashes.
IO-247A

Troubleshooting Chart

Associated
Fault Description(s)
LED Code 2
• Primary limit
circuit is open.
4
4 FLASHES
• Flame sensed with
5
no call for heat.
5 FLASHES
• Polarity of 115
C
volt power is
reversed.
CONTINUOUS
FLASHING
• Flame sense
microamp signal is
7
low.
7 FLASHES
• Problem with
8
igniter circuit.
8 FLASHES
• High stage
9
pressure switch
circuit does not
close in response
9 FLASHES
to high stage
induced draft
blower operation.
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
• Polarity of 115 volt AC
power to furnace or
integrated control module
is reversed.
• Poor unit ground.
• 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.
30
Corrective Action Cautions and Notes
• Check filters and • Turn power OFF
ductwork for blockage.
Clean filters or remove
• See Product Data
obstruction.
• Check circulator blower
speed and performance.
Correct speed or replace
blower if necessary.
• Check burners for proper
alignment.
• Check flue and air inlet
• Replace pressure
piping for blockage,
proper length, elbows,
and termination. Correct
as necessary.
• 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
• Turn power OFF
• Review wiring diagram to
correct polarity.
• Verify proper ground.
Correct if necessary.
• Check and correct wiring.
• Turn power OFF
• Sand flame sensor is
coated/oxidized.
• Sand flame
• Inspect for proper sensor
alignment.
• Check inlet air piping for
• See "Vent/Flue
blockage, proper length,
elbows, and termination.
• Compare current gas
• See rating plate
pressure to rating plate
info. Adjust as needed.
• Check and correct wiring
• Turn power OFF
from integrated control
module to igniter
• Replace igniter
• Replace bad igniter
• Check and correct unit
ground wiring
• Inspect pressure switch
• Turn power OFF
hose. Repair, if necessary.
• Inspect flue and/or inlet
• Replace pressure
air piping for blockage,
proper length, elbows,
and termination. Check
drain system. Correct as
necessary.
• Correct pressure switch
setpoint or contact
motion.
• Tighten or correct wiring
connection.
prior to repair.
Bulletin for
allowable rise
range and proper
circulator speed.
See "Vent/Flue
Pipe" section for
piping details.
switch with proper
replacement part.
prior to repair.
prior to repair.
prior to repair.
sensor with
emery clot.
Pipe" section for
piping details.
for proper gas
pressure.
prior to repair.
with proper
silicon nitride
replacement part.
prior to repair.
switch with
proper
replacement part.
12/04