Troubleshooting - Goodman AMH8 Service Instructions Manual

TROUBLESHOOTING

T
ROUBLESHOOTING
Symptoms of Abnormal Symptoms of Abnormal Symptoms of Abnormal
• 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
• LED is Steady On. • LED is Steady On. • LED is Steady On.
• 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
• 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 TWO (2) is flashing TWO (2) is flashing TWO (2)
• Induced draft blower • Induced draft blower • Induced draft blower
runs continuously with runs continuously with runs continuously with
no further furnace no further furnace no further furnace
operation. operation. operation.
• Integrated control • Integrated control • Integrated control
module diagnostic LED module diagnostic LED module diagnostic LED
is flashing THREE (3) is flashing THREE (3) is flashing THREE (3)
1 1 1 Integrated control module will automatically attempt to reset from lockout after one hour. Integrated control module will automatically attempt to reset from lockout after one hour. Integrated control module will automatically attempt to reset from lockout after one hour.
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.
40
C
HART
Associated Associated Associated
Associated Associated Associated Fault Description(s) Fault Description(s) Fault Description(s)
Fault Fault Fault
• No 115 volt power to • No 115 volt power to • No 115 volt power to
NONE NONE NONE
furnace, or no 24 furnace, or no 24 furnace, or no 24
volt power to volt power to volt power to
integrated control integrated control integrated control
module. module. module.
• Blown fuse or circuit • Blown fuse or circuit • Blown fuse or circuit
breaker. breaker. breaker.
• Integrated control • Integrated control • Integrated control
module has an module has an module has an
• Normal Operation • Normal Operation • Normal Operation
ON ON ON
CONTINUOUS CONTINUOUS CONTINUOUS
• Furnace lockout • Furnace lockout • Furnace lockout
due to an excessive due to an excessive due to an excessive
1 1 1
number of ignition number of ignition number of ignition
• Pressure switch • Pressure switch • Pressure switch
circuit is closed. circuit is closed. circuit is closed.
2 2 2
• Induced draft • Induced draft • Induced draft
blower is not blower is not blower is not
• Pressure switch • Pressure switch • Pressure switch
circuit not closed. circuit not closed. circuit not closed.
3 3 3
• Induced draft • Induced draft • Induced draft
A/GMH8, GDH8, ADSH8
Possible Causes Possible Causes Possible Causes
Possible Causes Possible Causes Possible Causes
• Manual disconnect • Manual disconnect • Manual disconnect • Assure 115 and 24 volt • Assure 115 and 24 volt • Assure 115 and 24 volt
switch OFF, door switch switch OFF, door switch switch OFF, door switch power to furnace power to furnace power to furnace
open, or 24 volt wires open, or 24 volt wires open, or 24 volt wires integrated control module. integrated control module. integrated control module.
improperly connected or improperly connected or improperly connected or
• Check integrated control • Check integrated control • Check integrated control
loose. loose. loose.
module fuse (3A). module fuse (3A). module fuse (3A).
• Blown fuse or circuit • Blown fuse or circuit • Blown fuse or circuit Replace if necessary. Replace if necessary. Replace if necessary.
breaker. breaker. breaker.
• Check for possible shorts • Check for possible shorts • Check for possible shorts
• Integrated control module • Integrated control module • Integrated control module in 115 and 24 volt circuits. in 115 and 24 volt circuits. in 115 and 24 volt circuits.
Repair as necessary. Repair as necessary. Repair as necessary.
• Replace bad integrated • Replace bad integrated • Replace bad integrated
•Normal Operation •Normal Operation •Normal Operation • None • None • None
• Failure to establish flame. • Failure to establish flame. • Failure to establish flame.
• Locate and correct gas • Locate and correct gas • Locate and correct gas
Cause may be no gas to Cause may be no gas to Cause may be no gas to
burners, front cover burners, front cover burners, front cover
• Check front cover • Check front cover • Check front cover
pressure switch stuck pressure switch stuck pressure switch stuck
open, bad igniter or igniter open, bad igniter or igniter open, bad igniter or igniter
alignment, improper alignment, improper alignment, improper
orifices, or coated/oxidized orifices, or coated/oxidized orifices, or coated/oxidized
or improperly connected or improperly connected or improperly connected
• Replace or realign • Replace or realign • Replace or realign
flame sensor. flame sensor. flame sensor.
• Loss of flame after • Loss of flame after • Loss of flame after
• Check flame sense • Check flame sense • Check flame sense
establishment. Cause may establishment. Cause may establishment. Cause may
be interrupted gas supply, be interrupted gas supply, be interrupted gas supply,
lazy burner flames lazy burner flames lazy burner flames
• Check flue piping for • Check flue piping for • Check flue piping for
(improper gas pressure or (improper gas pressure or (improper gas pressure or
restriction in flue and/or restriction in flue and/or restriction in flue and/or
combustion air piping), combustion air piping), combustion air piping),
front cover pressure switch front cover pressure switch front cover pressure switch
opening, or improper opening, or improper opening, or improper • Verify proper induced • Verify proper induced • Verify proper induced
induced draft blower induced draft blower induced draft blower
• Induced draft blower • Induced draft blower • Induced draft blower
• Replace induced draft • Replace induced draft • Replace induced draft
pressure switch contacts pressure switch contacts pressure switch contacts
sticking. sticking. sticking.
• Shorts in pressure switch • Shorts in pressure switch • Shorts in pressure switch
• Pressure switch hose • Pressure switch hose • Pressure switch hose • Inspect pressure • Inspect pressure • Inspect pressure
blocked, pinched or blocked, pinched or blocked, pinched or
connected improperly. connected improperly. connected improperly.
• Blocked flue and/or inlet air • Blocked flue and/or inlet air • Blocked flue and/or inlet air • Inspect flue and/or • Inspect flue and/or • Inspect flue and/or
pipe, blocked drain pipe, blocked drain pipe, blocked drain
system, or weak induced system, or weak induced system, or weak induced
draft blower. draft blower. draft blower.
• Incorrect pressure switch • Incorrect pressure switch • Incorrect pressure switch
setpoint or malfunctioning setpoint or malfunctioning setpoint or malfunctioning
switch contacts. switch contacts. switch contacts.
• Correct pressure • Correct pressure • Correct pressure
• Loose or improperly • Loose or improperly • Loose or improperly
• Tighten or correct • Tighten or correct • Tighten or correct
Corrective Action Corrective Action Corrective Action
Cautions and Cautions and Cautions and
• Turn power OFF • Turn power OFF • Turn power OFF
prior to repair. prior to repair. prior to repair.
• Replace inte- • Replace inte- • Replace inte-
grated control grated control grated control
module fuse with module fuse with module fuse with
3A automotive 3A automotive 3A automotive
fuse. fuse. fuse.
• Read precautions • Read precautions • Read precautions
in "Electrostatic in "Electrostatic in "Electrostatic
•Normal Operation •Normal Operation •Normal Operation
• Turn power • Turn power • Turn power
interruption. interruption. interruption.
OFF prior to OFF prior to OFF prior to
repair. repair. repair.
pressure switch pressure switch pressure switch
• Igniter is • Igniter is • Igniter is
operation (hose, wiring, operation (hose, wiring, operation (hose, wiring,
fragile, handle fragile, handle fragile, handle
contact operation). contact operation). contact operation). with care. with care. with care.
Correct if necessary. Correct if necessary. Correct if necessary.
• Sand flame • Sand flame • Sand flame
sensor with sensor with sensor with
igniter. igniter. igniter.
emery cloth. emery cloth. emery cloth.
• See "Vent/ • See "Vent/ • See "Vent/
signal. Sand sensor if signal. Sand sensor if signal. Sand sensor if
Flue Pipe" Flue Pipe" Flue Pipe"
coated and/or oxidized. coated and/or oxidized. coated and/or oxidized. section for section for section for
blockage, proper blockage, proper blockage, proper
length, elbows, and length, elbows, and length, elbows, and
termination. termination. termination.
draft blower perfor- draft blower perfor- draft blower perfor-
• Turn power OFF • Turn power OFF • Turn power OFF
prior to repair. prior to repair. prior to repair.
blower pressure blower pressure blower pressure
switch. switch. switch.
• Replace pressure • Replace pressure • Replace pressure
switch with proper switch with proper switch with proper
• Turn power • Turn power • Turn power
switch hose. Repair, if switch hose. Repair, if switch hose. Repair, if OFF prior to OFF prior to OFF prior to
necessary, necessary, necessary,
repair. repair. repair.
• Replace • Replace • Replace
inlet air piping for inlet air piping for inlet air piping for pressure pressure pressure
blockage, proper blockage, proper blockage, proper switch with switch with switch with
length, elbows, and length, elbows, and length, elbows, and proper proper proper
termination. Check termination. Check termination. Check replacement replacement replacement
drain system. Correct drain system. Correct drain system. Correct
as necessary. as necessary. as necessary.
switch setpoint or switch setpoint or switch setpoint or
contact motion. contact motion. contact motion.