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Symptoms of
Diagnostic/
Abnormal
Status LED
Operation
Code
Furnace fails to
b0
operate.
Integrated
control module
LED display
provides "b0"
error 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.
36
Fault Description Possible Causes
Circulator
Loose wiring
blower motor is
connection at
not running
circulator motor
when it should
power leads or
be running.
circulator motor
power leads
disconnected.
Open circuit in
inductor or loose
wiring connection
at inductor (³⁄₄ Hp
and 1 Hp models
only).
Failed circulator
blower motor.
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.
Corrective Actions
Tighten or correct
wiring connection.
Verify continuous
circuit through
inductor. Replace if
open or short circuit.
Check circulator
blower motor. Replace
if necessary.
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.
Notes and Cautions
Turn off power prior to
repair.
Replace inductor with
correct replacement
part.
Replace circulator
motor with correct
replacement part.
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.
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