Troubleshooting Chart - Amana AMS9 Installation Instructions Manual

Symptoms of Abnormal
Operation
• Furnace fails to operate.
• Integrated control
module diagnostic LED
provides no signal.
• LED is Steady On.
• 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)
flashes.
• Induced draft blower runs
continuously with no
further furnace operation.
• Integrated control
module diagnostic LED
is flashing THREE (3)
flashes.
1
Integrated control module will automatically attempt to reset from lockout after one hour.
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
TR TR TROUBLESH OUBLESH OUBLESH OUBLESHOO
TR TR OUBLESH
Associated
Associated
Fault Description(s)
Fault Description(s)
LED Code 2
2
LED Code
NONE • No 115 volt power to
furnace, or no 24 volt
power to integrated
control module.
• Blown fuse or circuit
breaker.
• Integrated control
module has an
internal fault.
• Normal Operation
ON
CONTINUOUS
ON
• Furnace lockout due
to an excessive
1
number of ignition
"retries" (3 total) or
1 FLASH
"recycles infinite 1
• Pressure switch
circuit is closed.
2
• Induced draft
blower is not
2 FLASHES
operating.
• Pressure switch
circuit not closed.
3
• Induced draft blower
is operating.
3 FLASHES
OO OO OOTIN TING CHAR TIN TIN G CHAR G CHART T T T T G CHAR
OO TIN G CHAR
Possible Causes
Possible Causes
• Manual disconnect switch
OFF, door switch open, or
24 volt wires improperly
connected or loose.
• Blown fuse or circuit
breaker.
• Integrated control module
has an internal fault.
• Improper thermostat
connection or setting.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
. bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
sensor.
• Loss of flame after
establishment. Cause may
be interrupted gas supply,
lazy burner flames (im-
proper gas pressure or
restriction in flue and/or
combustion air piping), front
cover pressure switch
opening, or improper
induced draft blower
performance.
• Induced draft blower
pressure switch contacts
sticking.
• Shorts in pressure switch
circuit.
• 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.
34
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 shorts in "Electrostatic
in 115 and 24 volt circuits. Discharge" section
Repair as necessary. of manual.
• Replace bad integrated
control module.
• Check thermostat • Turn power OFF
connections and prior to repair.
settings.
• Improper thermo-
stat connection or
setting.
• Turn power
• Locate and correct gas
OFF prior to
interruption.
repair.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
• Igniter is
igniter.
fragile, handle
• Check flame sense
with care.
signal. Sand sensor if
• Sand flame
coated and/or oxidized.
sensor with
• Check flue piping for
emery cloth.
blockage, proper
• See "Vent/Flue
length, elbows, and
Pipe" section
termination.
for piping
• Verify proper induced
details.
draft blower perfor-
mance.
• Replace induced draft • Turn power OFF
blower pressure prior to repair.
switch.
• Replace pressure
switch with proper
replacement part.
• Repair short.
• Inspect pressure • Turn power
switch hose. Repair, if OFF prior to
necessary, repair.
• Inspect flue and/or inlet • Replace
air piping for blockage, pressure
proper length, elbows, switch with
and termination. Check proper
drain system. Correct replacement
as necessary. part.
• Correct pressure
switch setpoint or
contact motion.
• Tighten or correct
wiring connection.