Amana GUCA Installation Instructions Manual page 42

Associated
Symptoms of Abnormal
Operation
LED Code
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control
4 FLASHES
module diagnostic LED
is flashing FOUR (4)
flashes.
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control
5 FLASHES
module diagnostic LED
is flashing FIVE (5)
flashes.
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing SIX (6)
6 FLASHES
flashes.
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control
7 FLASHES
module diagnostic LED
is flashing SEVEN (7)
flashes.
• Furnace not operating.
• Integrated control
module diagnostic LED
is flashing EIGHT (8)
flashes.
White-Rodgers
50A65 Only
8 FLASHES
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control
CONTINUOUS
module diagnostic LED
is flashing continuously.
Troubleshooting Chart
Fault Description(s)
2
• Primary or auxiliary
limit circuit is open.
4
• Rollout limit circuit is
open.
5
• Polarity of 115 or 24
volt power is
6
reversed.
• Flame sense
microamp signal is
7
low.
8
• Problem with igniter
circuit.
• Flame sensed with
no call for heat.
C
ON
Possible Causes
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed, or
failed circulator blower.
• Loose or improperly
connected wiring.
• Flame rollout.
• Misaligned burners, blocked
flue and/or air inlet pipe, or
failed induced draft blower.
• Loose or improperly
connected wiring.
• Polarity of 115 volt AC
power to furnace or
integrated control module is
reversed.
• Orange and gray wires to
transformer are reversed.
• Poor unit ground.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• Improperly connected
igniter
• Bad igniter
• Poor unit ground
• Short to ground in flame
sense circuit.
42
Corrective Action Cautions and Notes
• Check filters and • Turn power OFF
ductwork for blockage. prior to repair.
Clean filters or remove
• Replace pressure
obstruction.
switch with proper
• Check circulator blower replacement part.
speed and perfor-
mance. Correct speed
or replace blower if
necessary.
• Tighten or correct
wiring connection.
• Check burners for • Turn power OFF
proper alignment. prior to repair.
• Check flue and air inlet • See "Vent/Flue
piping for blockage, Pipe" section for
proper length, elbows, piping details.
and termination.
Correct as necessary.
• Check induced draft • Ensure the correct
pressure switch
blower for proper
performance. Re- replacement is
place, if necessary. used.
• Tighten or correct
wiring connection.
• Review wiring diagram • Turn power OFF
to correct polarity. prior to repair.
• Reverse orange and
gray wires going to
transformer.
• Verify proper ground.
Correct if necessary.
• Sand flame sensor is • Turn power OFF
coated/oxidized. prior to repair.
• Inspect for proper • Sand flame sensor
sensor alignment. with emery clot.
• Check inlet air piping • See "Vent/Flue
for blockage, proper Pipe" section for
length, elbows, and piping details.
termination.
• Compare current gas • See rating plate for
pressure to rating plate proper gas
info. Adjust as pressure.
needed.
• Check and correct • Turn power OFF
prior to repair.
wiring from integrated
control module to
• Replace igniter with
igniter
proper silicon
nitride replacement
• Replace bad igniter
part.
• Check and correct unit
ground wiring
• Correct short at flame • Turn power OFF
sensor or in flame prior to repair.
sensor wiring.