Troubleshooting Charts - Goodman AMV8 Installation And Operating Instructions Manual

Associated
Symptoms of Abnormal
Operation
LED Code
• Furnace fails to operate.
• Integrated control
module diagnostic LED
provides no signal.
• Furnace fails to
operate.
• Integrated control
module diagnostic LED
is lit continuously.
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing ONE (1)
flash.
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing TWO (2)
2 FLASHES
flashes.
• Induced draft blower
runs continuously with
no further furnace
operation.
3 FLASHES
• Integrated control
module diagnostic LED
is flashing THREE (3)
flashes.
1
Integrated control module will automatically attempt to reset from lockout after one hour.
IO-247A
Troubleshooting Chart
Fault Description(s)
2
NONE • No 115 volt power
to furnace, or no 24
volt power to
integrated control
module.
• Blown fuse or
circuit breaker.
• Intergrated contol
module has an
internal fault
• No signal from
thermostat
ON
1 FLASH
• Furnace lockout due
1 to an excessive
number of ignition
"retries" (3 total) 1 .
1 FLASH
• Auxiliary limit open
• Low stage pressure
2 switch circuit is
closed.
• Induced draft blower
is not operating.
• Pressure switch
3 circuit not closed.
• Induced draft blower
is operating.
Possible Causes
• Manual disconnect switch
OFF, door switch open, or
24 volt wires improperly
connected or loose.
• Blown fuse or circuit
breaker.
• Intergrated contol module
has an internal fault
• Improper thermostat
connection or setting.
• Failure to establish flame. • Locate and correct gas
Cause may be no gas to
burners, bad igniter or
• Replace or realign
igniter alignment,
improper orifices, or
• Check flame sense
coated/oxidized or
improperly connected
flame sensor.
• Check flue piping for
• Loss of flame after
establishment. Cause
may be interrupted gas
• Verify proper induced
supply, lazy burner flames
(improper gas pressure or
restriction in flue or
• Check circulator blower
improper induced draft
blower performance.
• Insufficient conditioned
air over the heat
exchanger. Blocked
filters, restrictive
ductwork, improper
circulator blower speed,
or failed circulator blower.
• Induced draft blower
pressure switch contacts
sticking.
• Shorts in pressure switch
circuit.
• Pressure switch hose
blocked, pinched or
connected improperly.
• Blocked flue or weak
induced draft blower.
• Incorrect pressure switch
setpoint or malfunctioning
switch contacts.
• Loose or improperly
connected wiring.
29
Corrective Action Cautions and Notes
• Assure 115 and 24 volt • Turn power OFF
power to furnace prior to repair.
integrated control
• Replace integrated
module.
control module
• Check integrated control
fuse with 3A
module fuse (3A).
automotive fuse.
Replace if necessary.
• Read precautions
• Check for possible
in "Electrostatic
shorts in 115 and 24 volt
Discharge" section
circuits. Repair as
of manual.
necessary.
• Replace bad intergrated
control module.
• Turn power OFF
• Check thermostat
prior to repair.
connections and
settings.
• Improper
thermostat
connection or
setting.
• Turn power OFF
prior to repair.
interruption.
• Igniter is fragile,
igniter.
handle with care.
• Sand flame sensor
signal. Sand sensor if
with emery cloth.
coated and/or oxidized.
• See "Combustion
blockage, proper length,
and Ventilation Air
elbows, and termination.
Requirements" and
"Category I
draft blower
Venting (Vertical
performance.
Venting)" section
for details.
speed and performance.
• See Product Data
Correct speed or replace
Bulletin for
blower if necessary.
allowable rise
range and proper
circulator speed.
• Replace induced draft • Turn power OFF
blower pressure prior to repair.
switch.
• Replace pressure
• Repair short. switch with proper
replacement part.
• Inspect pressure • Turn power OFF
switch hose. Repair, if prior to repair.
necessary,
• See "Combustion
and Ventilation Air
• Inspect flue for
Requirements"
blockage, proper
and "Category I
length, elbows, and
Venting (Vertical
termination.
Venting)" section
• Correct pressure
for details.
switch setpoint or
• Replace pressure
contact motion.
switch with proper
• Tighten or correct
replacement part.
wiring connection.
12/04