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Symptoms of
Diagnostic/
Abnormal
Staus LED
Operation
Code
Furnace fails to
b1
operate.
Integrated
control module
LED display
provides "b1"
error code.
Furnace fails to
b2
operate.
Integrated
control module
LED display
provides "b2"
error code.
Furnace
b3
operates at
reduced
performance.
Airflow
delivered is less
than expected.
Integrated
control module
LED display
provides "b3"
error code.
Furnace fails to
b4
operate.
Integrated
control module
LED display
provides "b4"
error code.
36
Fault Description Possible Causes
Integrated
Loose wiring
control module
connection at
has lost
circulator motor
communication
control leads.
s with circulator
Failed circulator
blower motor.
blower motor.
Failed integrated
control module.
Circulator
Incorrect circulator
blower motor
blower motor in
horse power in
furnace.
shared data set
Incorrect shared
does not match
data set in
circulator
integrated control
blower motor
module.
horse power.
Circulator
Blocked filters.
blower motor is
Restrictive
operating in a
ductwork.
power,
Undersized
temperature or
ductwork.
speed limiting
High ambient
condition.
temperatures.
Circulator
Abnormal motor
blower motor
loading, sudden
senses a loss of
change in speed or
rotor control.
torque, sudden
blockage of
Circulator
furnace air inlet or
blower motor
outlet.
senses high
current.
High loading
conditions, blocked
filters, very
restrictive
ductwork,
blockage of
furnace air inlet or
outlet.
Corrective Actions
Tighten or correct
wiring connection.
Check circulator
blower motor. Replace
if necessary.
Check integrated
control module.
Replace if necessary.
Verify circulator blower
motor horse power is
the same specified for
the specific furnace
model. Replace if
necessary.
Verify shared data set
is correct for the
specific model.
Repopulate data using
correct memory card, if
required.
Check filters for
blockage. Clean filters
or remove obstruction.
Check ductwork for
blockage. Remove
obstruction. Verify all
registers are fully open.
Verify ductwork is
appropriately sized for
system. Resize/replace
ductwork if necessary.
See "Product
Description" and
"Location
Requirements and
Considerations" for
furnace installation
requirements.
Check filters, filter
grills/registers, duct
system and furnace air
inlet/outlet for
blockages.
Notes and Cautions
Turn off power prior to
repair.
Replace circulator
motor with correct
replacement part.
Replace integrated
control module with
correct replacement
part.
Turn off power prior to
repair.
Replace motor with
correct replacement
part.
Use memory card for
the specific model
Insert memory card
before turning on
power. Memory card
may be removed after
data is loaded.
Turn off power before
removing memory
card.
Error code will be
cleared once shared
data and motor horse
power match.
Turn off power prior to
repair.
Turn off power prior to
repair.
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