TROUBLESHOOTING
62
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Gas valve is
energized w hen it
should not be.
• Internal Gas Valve
Error
• Misw ired gas valve circuit
• Shorted gas valve w iring
• Gas valve relay on
integrated control board
stuck open
• Check w iring in gas valve circuit
• Replace integrated control board
• Turn pow er OFF prior to
repair.
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Aux limit sw itch
open (blow er
compartment)
• 115 volt pow er supply
w as shut off during heat
cycle.
•.Insuffcient conditioned air
over the heat exchanger.
Blocked flters, restrictive
ductw ork, improper
circulator blow er speed, or
failed circulator blow er
motor.
• Loose or improperly
connected w iring in high limit
circuit.
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Aux sw itch
(condensate sw itch)
open
• High w ater level in the
evaporation coil.
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Grounding Fault
• Poor neutral connection
• Verify neutral w ire connection to
furnace & continuity to ground
source
• Turn pow er off prior to
service
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Open roll out sw itch • Gas pressure too high
• Burners mis-aligned
• Restricted heat exchanger
or venting
• Check / correct gas pressure
• Check / correct burner alignment
• Check / correct restriction
• Turn pow er off prior to
service
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Data not yet on
netw ork.
No Netw ork Data
• Turn pow er OFF prior to
repair
• Use memory card for the
specifc model.
• Insert memory card
BEFORE turning pow er ON.
Memory card may be
removed after data is loaded
and pow er is turned off.
• Error code w ill be cleared
once data is turned off.
• Operation different than
expected or no operation.
• Integrated control module LED
display provides
error code.
• Invalid memory card
data.
• Shared data set on
memory card has been
rejected by integrated
control module
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Circulator blow er
motor is not running
w hen it should be
running.
• Loose w iring connection
at circulator motor pow er
leads or circulator motor
pow er leads disconnected.
• Open circuit in inductor or
loose w iring connection at
inductor (3/4 Hp and 1 Hp
models only).
• Failed circulator blow er
motor.
Symptoms of Abnormal
Operation
Diagnostic /
Status LED
Codes
Fault Description
Possible Causes
Corrective Actions
Notes & Cautions
• Verify shared data set is correct
for the specifc model. Re-populate
data using correct memory card if
required.
• Turn pow er OFF prior to
repair
• Use memory card for the
specifc model.
• Insert memory card
BEFORE turning pow er ON.
Memory card may be
removed after data is loaded
and pow er is turned off.
• Error code w ill be cleared
once data is loaded and
pow er is turned off.
• Tighten or correct w iring
connection.
• Verify continuous circuit through
inductor.
Replace if open or short circuit.
• Check circulator blow er motor.
Replace if necessary.
• Turn pow er OFF prior to
repair
• Replace inductor w ith
correct replacement part.
• Replace circulator motor
w ith correct replacement
part.
• Populate shared data set using
memory card.
• Check evap drain pan, trap,
piping.
• Turn pow er OFF prior to
service.
• Check flters and ductw ork for
blockage. Clean flters or remove
obstruction.
• Check circulator blow er speed
and performance. Correct
speed or replace blow er motor if
necessary.
• Tighten or correct w iring
connection.
• Turn pow er OFF prior to
repair.
• See Specifcation Sheet
applicable to your model* for
allow able rise range and
proper circulator speed.
