Goodman ACS series Service Instructions Manual page 91

SYSTEM OPERATION
T
ROUBLESHOOTING
Associated
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.
CONTINUOUS
• 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.
1
Integrated control module will automatically attempt to reset from lockout after one hour.
2
LED flash code will cease if power to control module is interrupted throught the disconnect or door switch.
4
Applies to ADV8, AMV8, GMV8 only.
C
HART
ADV8, AMV8, ACV9, AMV9, GMV8, GCV9, GMV9
Fault
Description(s)
2
LED Code
• Insufficient conditioned
• Primary limit
circuit is
4
open.
4 FLASHES
• Flame rollout.
• Misaligned burners,
• Loose or improperly
• Short to ground in flame
• Flame
5
sensed
with no call • Lingering burner flame.
5 FLASHES
for heat.
• Slow closing gas valve
• Polarity of 115 volt AC
• Polarity of
C
power to furnace or
115 volt
integrated control
power is
module is reversed.
reversed.
• Poor unit ground.
FLASHING
• Flame • Flame sensor is
7 sense
microamp
• Flame sensor
signal is
7 FLASHES
low.
• Lazy burner flame due
• Improperly connected
• Problem
with
8
igniter • Bad igniter
circuit.
• Poor unit ground
8 FLASHES
• Pressure switch hose
• High stage
blocked, pinched or
pressure
9
connected improperly.
switch
circuit
• Blocked flue and/or inlet
9 FLASHES does not
air pipe, blocked drain
close in
system, or weak induced
response
draft blower.
to high
• Incorrect pressure switch
stage
setpoint or malfunctioning
induced
switch contacts.
draft
blower
• Loose or improperly
operation.
connected wiring.
Possible Causes
• Check filters and ductwork
for blockage. Clean filters or
air over the heat
remove obstruction.
exchanger. Blocked
filters, restrictive • Check circulator blower
speed and performance.
ductwork, improper
circulator blower speed, Correct speed or replace
blower if necessary.
or failed circulator
blower.
• Check burners for proper
alignment.
• Check flue and air inlet
piping for blockage, proper
blocked flue and/or air
inlet pipe, or failed length, elbows, and
termination. Correct as
induced draft blower.
necessary.
• Check induced draft blower
connected wiring.
for proper performance.
Replace, if necessary.
• Tighten or correct wiring
connection.
• Correct short at flame
sense circuit.
sensor or in flame sensor
wiring.
• Check for lingering flame
• Verify proper operation of
gas valve
• Review wiring diagram to
correct polarity.
• Verify proper ground.
Correct if necessary.
• Check and correct wiring.
• Sand flame sensor is
coated/oxidized.
coated/oxidized.
• Inspect for proper sensor
alignment.
incorrectly positioned
in burner flame.
• Check inlet air piping for
blockage, proper length,
elbows, and termination.
to improper gas
pressure or combus-
• Compare current gas
tion air.
pressure to rating plate info.
Adjust as needed.
• Check and correct wiring
from integrated control
igniter
module to igniter
• Replace bad igniter
• Check and correct unit
ground wiring
• Inspect pressure switch hose.
Repair, if necessary.
• Inspect flue and/or inlet air
piping for blockage, proper
length, elbows, and
termination. Check drain
system. Correct as neces-
sary.
• Correct pressure switch
setpoint or contact motion.
• Tighten or correct wiring
connection.
Corrective Action Cautions and Notes
• Turn power OFF
prior to repair.
• See Product Data
Bulletin for
allowable rise range
and proper
circulator speed.
See "Vent/Flue
Pipe" section for
piping details.
• Replace pressure
switch with proper
replacement part.
• Turn power OFF
prior to repair.
• Turn power OFF
• Turn power OFF
prior to repair.
• Sand flame sensor
with emery clot.
• See "Vent/Flue
Pipe" section for
piping details.
• See rating plate
for proper gas
pressure.
• Turn power OFF
• Replace igniter
• Turn power OFF
• Replace
prior to repair.
prior to repair.
with replacement
part.
prior to repair.
pressure switch
with proper
replacement
part.
91