Goodman ACVC8 CA Series AMVC8 CA Series Service And Troubleshooting page 47

TROUBLESHOOTING
Sym ptom s of Abnorm al
Operation
• Furnace fails to operate
• Integrated control module LED
display provides no signal.
• LED display indicates
• Furnace fails to operate
• Integrated control module LED
display provides error code.
• Furnace fails to operate.
• Integrated control module LED
display provides error code.
.
• Induced draft blow er
runs continuously w ith no
further furnace operation.
• Integrated control module LED
display provides error code.
• Circulator blow er runs
continuously. No furnace
operation.
• Integrated control module LED
display provides error code.
Diagnostic /
Status LED Fault Description
Codes
None • No 115 pow er to
furnace or no 24 volt
pow er to integrated
control module
• Blow n fuse or
tripped circuit breaker
• Integrated control
module is non-
functional
• N r o m a o l p e a r o i t n
• Furnace lockout due
to an excessive
number of ignition
"retries" (3 total)
• Low stage
pressure sw itch
circuit is closed at
start of heating cycle.
• Low stage
pressure sw itch
circuit is not closed.
• Primary limit circuit
is open.
Possible Causes
• Manual disconnect sw itch • Check 115 pow er to furnace and
turned OFF, door sw itch
integrated control module.
open or 24 volt w ire • Check for possible shorts in 115
improperly connected or circuit. Repair as necessary.
loose • Replace non-functional
• Furnace electrical supply integrated control module.
shared w ith other devices
• Integrated control module
is non-functional
• Normal operation • None
• Failure to establish flame. • Locate and correct gas
Cause may be no gas to interruption.
burners, front cover • Check front cover pressure
pressure sw itch stuck sw itch operation (hose, w iring,
open, bad igniter or igniter contact operation). Correct if
alignment, improper orifces, necessary.
• Replace or realign igniter.
or coated/oxidized or
improperly connected fame • Check fame sense signal. Sand
sensor. sensor if coated and/or oxidized.
• Loss of fame after • Check fue piping for blockage,
establishment. Cause may
proper length, elbow s, and
be interrupted gas supply, termination.
lazy burner fames (improper • Verify proper induced draft
gas pressure or restriction blow er performance.
in fue and/ or combustion air
piping),
front cover pressure sw itch
opening, or improper
induced draft blow er
performance.
• Low stage pressure • Replace low stage pressure
sw itch contacts sticking. sw itch.
• Shorts in pressure sw itch • Repair short in w iring.
circuit w iring.
• Pressure sw itch hose • Inspect pressure sw itch hose.
blocked pinched, or Repair/replace if necessary.
connected improperly. • Inspect fue and/or inlet air piping
• Blocked fue and/or inlet air for blockage, proper length,
pipe, blocked drain system elbow s, and termination. Check
or w eak induced draft drain system. Correct as
blow er. necessary.
• Incorrect pressure sw itch • Check induced draft blow er
set point or malfunctioning performance. Correct as
sw itch contacts. necessary.
• Loose or improperly • Correct pressure sw itch set
connected w iring. point or contact motion.
• Tighten or correct w iring
connection.
• Insuffcient conditioned air • Check flters and ductw ork for
over the heat exchanger. blockage. Clean flters or remove
Blocked flters, restrictive obstruction.
ductw ork, improper • Check circulator blow er speed
circulator blow er speed, or and performance. Correct
failed circulator blow er speed or replace blow er motor if
motor. necessary.
• Tighten or correct w iring
• Loose or improperly connection.
connected w iring in high limit
circuit.
Corrective Actions
• Turn pow er OFF prior to
repair.
• Read precautions in
"Electrostatic
Discharge" section of manual.
• Replace control w ith
correct replacement part
• N
• Turn pow er OFF prior to
repair.
• Igniter is fragile, handle w ith
care.
• Clean fame sensor w ith
steel w ool.
• See "Vent/Flue Pipe"
section for piping details.
• Turn pow er OFF prior to
repair.
• Replace pressure sw itch
w ith proper replacement part.
• Turn pow er OFF prior to
repair.
• Replace pressure sw itch
w ith proper replacement part.
• Replace induced draft
blow er w ith proper
replacement part.
• Turn pow er OFF prior to
repair.
• See Specifcation Sheet
applicable to your model* for
allow able rise range and
proper circulator speed.
Notes & Cautions
r o m a o l p e a r o i t n
47