Goodman AMH8 Service Instructions Manual page 41

TROUBLESHOOTING
T
ROUBLESHOOTING
Symptoms of Symptoms of Symptoms of
Abnormal Operation Abnormal Operation Abnormal Operation
• Circulator blower runs • Circulator blower runs • Circulator blower runs
continuously. No furnace continuously. No furnace continuously. No furnace
operation. operation. operation.
• Integrated control module • Integrated control module • Integrated control module
diagnostic LED is flashing diagnostic LED is flashing diagnostic LED is flashing
FOUR (4) flashes. FOUR (4) flashes. FOUR (4) flashes.
• Induced draft blower and • Induced draft blower and • Induced draft blower and
circulator blower runs circulator blower runs circulator blower runs
continuously. No furnace continuously. No furnace continuously. No furnace
operation. operation. operation.
• Integrated control module • Integrated control module • Integrated control module
diagnostic LED is diagnostic LED is diagnostic LED is
flashing FIVE (5) flashes. flashing FIVE (5) flashes. flashing FIVE (5) flashes.
• Furnace fails to operate. • Furnace fails to operate. • Furnace fails to operate.
• Integrated control • Integrated control • Integrated control
module diagnostic LED module diagnostic LED module diagnostic LED
is flashing SIX (6) is flashing SIX (6) is flashing SIX (6)
flashes. flashes. flashes.
• No furnace operation. • No furnace operation. • No furnace operation.
• Normal furnace • Normal furnace • Normal furnace
operation. operation. operation.
• Integrated control • Integrated control • Integrated control
module diagnostic LED module diagnostic LED module diagnostic LED
is flashing SEVEN (7) is flashing SEVEN (7) is flashing SEVEN (7)
flashes. flashes. flashes.
• Furnace not operating. • Furnace not operating. • Furnace not operating.
• Integrated control • Integrated control • Integrated control
module diagnostic LED module diagnostic LED module diagnostic LED
is flashing EIGHT (8) is flashing EIGHT (8) is flashing EIGHT (8)
flashes. flashes. flashes.
• Induced draft blower runs • Induced draft blower runs • Induced draft blower runs
continuously. No furnace continuously. No furnace continuously. No furnace
operation. operation. operation.
• Integrated control module • Integrated control module • Integrated control module
diagnostic LED is diagnostic LED is diagnostic LED is
flashing continuously. flashing continuously. flashing continuously.
• LED is steady on • LED is steady on • LED is steady on
2 2 2 LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch. LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch. LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
C
HART
Fault Fault Fault
Associated Associated Associated
Description(s) Description(s) Description(s)
LED Code LED Code LED Code 2 2 2
• Primary limit • Primary limit • Primary limit
circuit is open. circuit is open. circuit is open.
4 4 4
• Flame • Flame • Flame
5 5 5
sensed with sensed with sensed with
no call for no call for no call for
heat. heat. heat.
• Rollout limit • Rollout limit • Rollout limit
6 6 6 open. open. open.
• Integrated • Integrated • Integrated
control module control module control module
fuse is blown. fuse is blown. fuse is blown.
• Flame sense • Flame sense • Flame sense
7 7 7 microamp signal is microamp signal is microamp signal is
low. low. low.
• Problem with • Problem with • Problem with
igniter circuit. igniter circuit. igniter circuit.
• Polarity of • Polarity of • Polarity of
C C C
115 or 24 volt 115 or 24 volt 115 or 24 volt
power is power is power is
reversed. reversed. reversed.
CONTINUOUS CONTINUOUS CONTINUOUS
FLASHING FLASHING FLASHING
STEADY STEADY STEADY
• Normal operation. • Normal operation. • Normal operation.
ON
A/GMH8, GDH8, ADSH8
Possible Causes Possible Causes Possible Causes
• Check primary limit. • Check primary limit. • Check primary limit.
• Insufficient conditioned air • Insufficient conditioned air • Insufficient conditioned air
Replace if necessary. Replace if necessary. Replace if necessary.
over the heat exchanger. over the heat exchanger. over the heat exchanger.
Blocked filters, restrictive Blocked filters, restrictive Blocked filters, restrictive
• Check filters and ductwork • Check filters and ductwork • Check filters and ductwork
ductwork, improper ductwork, improper ductwork, improper
for blockage. Clean filters for blockage. Clean filters for blockage. Clean filters
circulator blower speed, or circulator blower speed, or circulator blower speed, or
or remove obstruction. or remove obstruction. or remove obstruction.
failed circulator blower. failed circulator blower. failed circulator blower.
• Check circulator blower • Check circulator blower • Check circulator blower
• Faulty primary limit switch. • Faulty primary limit switch. • Faulty primary limit switch. speed and performance. speed and performance. speed and performance.
Correct speed or replace Correct speed or replace Correct speed or replace
• Loose or improperly • Loose or improperly • Loose or improperly
blower if necessary. blower if necessary. blower if necessary.
connected wiring. connected wiring. connected wiring.
• Tighten or correct wiring • Tighten or correct wiring • Tighten or correct wiring
connection. connection. connection.
• Short to ground in • Short to ground in • Short to ground in
• Correct short at • Correct short at • Correct short at
flame sense circuit. flame sense circuit. flame sense circuit.
flame sensor or in flame sensor or in flame sensor or in
flame sensor wiring. flame sensor wiring. flame sensor wiring.
• Check burners for proper • Check burners for proper • Check burners for proper
• Flame rollout. • Flame rollout. • Flame rollout.
alignment. alignment. alignment.
• Misaligned burners, • Misaligned burners, • Misaligned burners,
• Check flue and air inlet • Check flue and air inlet • Check flue and air inlet
blocked flue and/or air blocked flue and/or air blocked flue and/or air
piping for blockage, piping for blockage, piping for blockage,
inlet pipe, or failed inlet pipe, or failed inlet pipe, or failed
proper length, elbows, proper length, elbows, proper length, elbows,
induced draft blower. induced draft blower. induced draft blower.
and termination. Correct and termination. Correct and termination. Correct
• Loose or improperly • Loose or improperly • Loose or improperly as necessary. as necessary. as necessary.
connected wiring. connected wiring. connected wiring.
• Check rollout limit. • Check rollout limit. • Check rollout limit.
Replace if necessary. Replace if necessary. Replace if necessary.
• Short in 24 volt AC • Short in 24 volt AC • Short in 24 volt AC
• Check induced draft • Check induced draft • Check induced draft
control circuits or control circuits or control circuits or
blower for proper blower for proper blower for proper
safety circuits. safety circuits. safety circuits.
performance. Replace, if performance. Replace, if performance. Replace, if
•Faulty rollout limit. •Faulty rollout limit. •Faulty rollout limit.
necessary. necessary. necessary.
• Tighten or correct wiring • Tighten or correct wiring • Tighten or correct wiring
connection. connection. connection.
• Repair short in 24 volt AC • Repair short in 24 volt AC • Repair short in 24 volt AC
control/safety circuit(s). control/safety circuit(s). control/safety circuit(s).
• Replace integrated • Replace integrated • Replace integrated
control module fuse (3A). control module fuse (3A). control module fuse (3A).
• Flame sensor is • Flame sensor is • Flame sensor is
• Sand flame sensor. • Sand flame sensor. • Sand flame sensor.
coated/oxidized. coated/oxidized. coated/oxidized.
• Inspect for proper sensor • Inspect for proper sensor • Inspect for proper sensor
• Flame sensor • Flame sensor • Flame sensor
alignment. alignment. alignment.
incorrectly positioned in incorrectly positioned in incorrectly positioned in
• Compare current gas • Compare current gas • Compare current gas
burner flame. burner flame. burner flame.
pressure to rating plate pressure to rating plate pressure to rating plate
• Lazy burner flame due • Lazy burner flame due • Lazy burner flame due
info. Adjust as needed. info. Adjust as needed. info. Adjust as needed.
to improper gas to improper gas to improper gas
pressure or combustion pressure or combustion pressure or combustion
air. air. air.
• Improperly connected • Improperly connected • Improperly connected
• Check and correct wiring • Check and correct wiring • Check and correct wiring
igniter. igniter. igniter.
from integrated control from integrated control from integrated control
• Bad igniter. • Bad igniter. • Bad igniter.
module to igniter. module to igniter. module to igniter.
• Poor unit ground. • Poor unit ground. • Poor unit ground.
•Replace bad igniter. •Replace bad igniter. •Replace bad igniter.
• Poor burner ground. • Poor burner ground. • Poor burner ground.
•Check and correct unit •Check and correct unit •Check and correct unit
• Faulty integrated control • Faulty integrated control • Faulty integrated control
ground wiring. ground wiring. ground wiring.
module. module. module.
• Replace bad integrated • Replace bad integrated • Replace bad integrated
control module. control module. control module.
• Polarity of 115 volt AC • Polarity of 115 volt AC • Polarity of 115 volt AC
• Review wiring diagram to • Review wiring diagram to • Review wiring diagram to
power to furnace or power to furnace or power to furnace or
correct polarity. correct polarity. correct polarity.
integrated control module integrated control module integrated control module
• Verify proper ground. • Verify proper ground. • Verify proper ground.
is reversed. is reversed. is reversed.
Correct if necessary. Correct if necessary. Correct if necessary.
• Red and blue wires to • Red and blue wires to • Red and blue wires to
transformer are reversed. transformer are reversed. transformer are reversed.
• Reverse red and blue • Reverse red and blue • Reverse red and blue
• Poor unit ground. • Poor unit ground. • Poor unit ground.
wires connected to wires connected to wires connected to
transformer. transformer. transformer.
Cautions Cautions Cautions
Corrective Action Corrective Action Corrective Action
& Notes & Notes & Notes
• Turn power OFF • Turn power OFF • Turn power OFF
prior to repair. prior to repair. prior to repair.
• Replace primary • Replace primary • Replace primary
switch with switch with switch with
proper replace- proper replace- proper replace-
ment part. ment part. ment part.
• Replace blower • Replace blower • Replace blower
with correct with correct with correct
replacement part. replacement part. replacement part.
• Turn power • Turn power • Turn power
OFF prior to OFF prior to OFF prior to
repair. repair. repair.
• See "Vent/Flue • See "Vent/Flue • See "Vent/Flue
Pipe" section for Pipe" section for Pipe" section for
piping details. piping details. piping details.
• Replace induced • Replace induced • Replace induced
draft blower with draft blower with draft blower with
proper replacement proper replacement proper replacement
part. part. part.
• Replace integrated • Replace integrated • Replace integrated
control module fuse control module fuse control module fuse
with 3A automotive with 3A automotive with 3A automotive
fuse. fuse. fuse.
• Read precautions • Read precautions • Read precautions
in "Electrostatic in "Electrostatic in "Electrostatic
Discharge" section Discharge" section Discharge" section
of manual. of manual. of manual.
• Replace rollout limit • Replace rollout limit • Replace rollout limit
with correct with correct with correct
replacement part. replacement part. replacement part.
• Turn power OFF • Turn power OFF • Turn power OFF
prior to repair. prior to repair. prior to repair.
• Clean flame • Clean flame • Clean flame
sensor with steel sensor with steel sensor with steel
wool. wool. wool.
• See "Vent/Flue • See "Vent/Flue • See "Vent/Flue
Pipe" section for Pipe" section for Pipe" section for
piping details. piping details. piping details.
• See rating plate • See rating plate • See rating plate
for proper gas for proper gas for proper gas
pressure. pressure. pressure.
• Turn power OFF • Turn power OFF • Turn power OFF
prior to repair. prior to repair. prior to repair.
• Replace igniter • Replace igniter • Replace igniter
with proper with proper with proper
replacement part. replacement part. replacement part.
• Read precautions • Read precautions • Read precautions
in "Electrostatic in "Electrostatic in "Electrostatic
Discharge" section Discharge" section Discharge" section
of manual. of manual. of manual.
• Turn power OFF • Turn power OFF • Turn power OFF
prior to repair. prior to repair. prior to repair.
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