Appendix D Troubleshooting Chart; Pcbbf134 & Pcbbf132 Control Boards - Amana M8 Installation Instructions Manual

T
ROUBLESHOOTING
Associated
Symptoms of
LED Code
Abnormal Operation
•Furnace fails to operate.
•Integrated control
module diagnostic LED
provides no signal.
•Furnace fails to operate.
•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.
C
HART
Fault
2 Description(s)
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.
•Furnace lockout due
to an excessive
1
number of ignition
attempts. (3 total) 1
1 FLASH
•Auxiliary Limit Open
•Pressure switch
circuit is closed.
2
•Induced draft blower
is not operating.
2 FLASHES
•Pressure switch
circuit not closed.
3
•Induced draft blower
is operating.
3 FLASHES
•If installed, manual
reset limit switch is
open on Masonry
Vent Kit (MVK).
PCBBF134 & PCBBF132 CONTROL BOARDS
Possible
Causes
•Assure 115 and 24 volt
•Manual disconnect switch
OFF, door switch open, or 24
volt wires improperly
connected or loose.
•Check for possible shorts
•Blown fuse or circuit breaker.
•Replace bad integrated
•Integrated control module
has an internal fault.
•Failure to establish flame.
Cause may be no gas to
burners, 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
(improper gas pressure or
restriction in flue or
improper induced draft
blower performance.
•Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed, or
failed circulator blower.
•Main power interruption
during heat cycle causing
auxiliary limit to open.
•Induced draft blower
pressure switch contacts
sticking.
•Shorts in pressure switch
circuit.
•Inspect pressure switch
•Pressure switch hose
blocked, pinched or
connected improperly.
•Inspect flue for blockage,
•Blocked flue or weak
induced draft blower.
•Correct pressure switch
•Incorrect pressure switch
setpoint or malfunctioning
switch contacts.
•Tighten or correct wiring
•Loose or improperly
connected wiring.
•Inspect masonry chimney
•Blockage in flue or chimney.
34
Corrective
Action
•Turn power OFF
prior to repair.
power to furnace
integrated control
module.
•Turn power OFF
prior to repair.
in 115 and 24 volt circuits.
Repair as necessary.
control module. •Read precautions
in "Electrostatic
Discharge" section
of manual.
•Locate and correct
•Turn power OFF
gas interruption.
prior to repair.
•Replace or realign
•Igniter is fragile,
igniter.
handle with care.
•Check flame sense
signal. Clean sensor if •Clean flame sensor
coated and/or with steel wool.
oxidized.
•See "Combustion
•Check flue piping for
and Ventilation Air
blockage, proper
Requirements" and
length, elbows, and
"Category I Venting
termination.
(Vertical Venting)"
•Verify proper induced section for details.
draft blower
•See Product Data
performance.
Bulletin for
•Check circulator
allowable rise
blower speed and
range and proper
performance. Correct
circulator speed.
speed or replace
blower if necessary.
•Turn power OFF
•Replace induced
prior to repair.
draft blower pressure
switch.
•Replace pressure
switch with proper
•Repair short.
replacement part.
•Turn power OFF prior
hose. Repair, if necessary, to repair.
•See "Combustion and
Ventilation Air
proper length, elbows,
Requirements" and
and termination.
"Category I Venting
(Vertical Venting)"
setpoint or contact
section for details.
motion.
•Replace pressure
switch with proper
connection.
replacement part.
•Replace masonry
and flue; remove
vent kit limit switch
with correct
blockage.
replacement part.
Cautions
& Notes