Troubleshooting Chart - Amana MSS9 Installation Instructions Manual

T C
ROUBLESHOOTING HART
Associated
Symptoms of Abnormal
Operation
LED Code
•Circulator blower runs
continuously. No
furnace operation.
•Integrated control
module diagnostic LED
is flashing FOUR (4)
flashes.
•Induced draft blower
and circulation blower
runs continuously. No
furnace operation.
•Integrated control
module diagnostic LED
is flashing FIVE (5)
flashes.
•Furnace fails to
operate.
•Integrated control
module diagnostic LED
is flashing SIX (6)
flashes.
•No furnace operation.
•Normal furnace
operation.
•Integrated control
module diagnostic LED
is flashing SEVEN (7)
flashes.
•Furnace not operating.
•Integrated control
module diagnostic LED
is flashing EIGHT (8)
flashes.
•Furnace fails to operate.
•Integrated control module
diagnostic LED is flashing
continuously.
•LED is steady on.
2 LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
Fault
Description(s)
2
•Primary or
auxiliary limit
4
circuit is
open.
4 FLASHES
•Flame sensed
with no call for
5
heat.
5 FLASHES
•Rollout limit
6 open.
•Integrated
control module
6 FLASHES
fuse is blown.
•Flame sense
microamp
7
signal is low.
7 FLASHES
•Problem with
igniter
7
8
circuit.
8 FLASHES
•Polarity of
C
115 or 24
volt power is
CONTINUOUS/
reversed.
RAPID FLASH
STEADY ON •Normal operation.
Possible Causes
•Faulty pirmary or
auxiliary limit switch.
•Insufficient condi-
tioned air over the
heat exchanger.
Blocked filters,
restrictive
ductwork, improper
circulator blower
speed, or failed
circulator blower.
•Loose or improperly
connected wiring.
•Short to ground in flame
sense circuit.
•Flame rollout.
•Misaligned burners,
blocked flue and/or
air inlet pipe, or
failed induced draft
blower.
•Loose or improperly
connected wiring.
•Short in 24 volt AC
control circuits or
safety circuits.
•Faulty rollout limit.
•Flame sensor is
coated/oxidized.
•Flame sensor incor-
rectly positioned in
burner flame.
•Lazy burner flame due
to improper gas
pressure or combus-
tion air.
•Improperly connected
igniter.
•Bad igniter.
•Poor unit ground.
•Poor burner ground.
•Faulty integrated
control module.
•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.
42
Corrective Action
•Check primary/
•Turn power OFF prior
auxiliary limit. Replace
if necessary.
•Replace primary/
•Check filters and
ductwork for blockage.
Clean filters or remove
obstruction.
•Replace blower with
•Check circulator
blower speed and
performance. Correct
speed or replace blower
if necessary.
•Tighten or correct
wiring connection.
•Correct short at
flame sensor or in
flame sensor wiring.
•Turn power OFF prior to
•Check burners for
proper alignment.
•See "Vent/Flue Pipe"
•Check flue and air inlet
piping for blockage,
proper length, elbows,
•Replace induced draft
and termination.
Correct as necessary.
•Check rollout limit.
•Replace integrated control
Replace if necessary.
•Check induced draft
blower for proper
•Read precautions in
performance. Replace,
if necessary.
•Tighten or correct
•Replace rollout limit with
wiring connection.
•Turn power OFF prior to
•Sand flame sensor.
•Inspect for proper
•Clean flame sensor with
sensor alignment.
•Compare current gas
•See "Vent/Flue Pipe"
pressure to rating
plate info. Adjust as
needed.
•See rating plate for
•Check and correct wiring
•Turn power OFF prior to
from integrated control
module to igniter.
•Replace igniter w/
•Replace bad igniter.
•Check & correct unit
•Read precautions in
ground wire.
•Replace bad integrated
control module.
•Review wiring diagram to
correct polarity.
•Reverse orange and gray
wires going to trans-
former.
•Verify proper ground.
Correct if necessary.
Cautions and
Notes
to repair.
auxiliary limit with
proper replacement
part.
correct replacement
part.
•Turn power OFF
prior to repair.
repair.
section for piping details.
blower with correct
replacement part.
module fuse with 3A
automotive fuse.
"Electrostatic Discharge"
section of manual.
correct replacement part.
repair.
steel wool.
section for piping
details.
proper gas pressure.
repair.
proper replacment part.
"Electrostatic Dis-
charge" section of
manual.
•Turn power OFF
prior to repair.