Troubleshooting Chart - Amana GUCA Installation 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
CONTINUOUS
is lit continuously.
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing ONE (1) flash.
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.
• Integrated control
3 FLASHES
module diagnostic LED
is flashing THREE (3)
flashes.
1
Integrated control module will automatically attempt to reset from lockout after one hour.

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.
• No signal from
thermostat.
• Integrated control
ON
module has an
internal fault.
ON
• Furnace lockout due
to an excessive
1
number of ignition
"retries" (3 total) or
"recycles (5 total) .
1
• Pressure switch
circuit is closed.
2
• Induced draft blower
is not operating.
• Pressure switch
circuit not closed.
3
• 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.
• Improper thermostat
connection or setting.
• Integrated control module
has an internal fault.
• 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.
41
Corrective Action Cautions and Notes
• Assure 115 and 24 volt • Turn power OFF
power to furnace prior to repair.
integrated control
module.
• Check integrated control • Replace integrated
module fuse (3A). control module
Replace if necessary. fuse with 3A
automotive fuse.
• Check for possible shorts
in 115 and 24 volt • Improper thermo-
circuits. Repair as stat connection or
necessary. setting.
• Replace bad integrated • Turn power OFF
control module. prior to repair.
• Read precautions
in "Electrostatic
Discharge" section
of manual.
• Turn power OFF
• Locate and correct gas
prior to repair.
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Igniter is fragile,
• Replace or realign
handle with care.
igniter.
• Sand flame sensor
• Check flame sense
with emery cloth.
signal. Sand sensor if
• See "Vent/Flue
coated and/or oxidized.
Pipe" section for
• Check flue piping for
piping details.
blockage, proper
length, elbows, and
termination.
• Verify proper induced
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 OFF
switch hose. Repair, if prior to repair.
necessary,
• Replace pressure
• Inspect flue and/or inlet switch with proper
air piping for blockage, replacement part.
proper length, elbows,
and termination. Check
drain system. Correct
as necessary.
• Correct pressure
switch setpoint or
contact motion.
• Tighten or correct
wiring connection.