46
Troubleshooting Chart
Symptom
LED Status
Fault Description
Corrective Actions
d0
Equipment lacks shared data
Populate shared data set using memory card
IdL
Normal operation
None
Furnace fails to operate
Integrated control module
LED display provides no
signal
None
No 115 power to furnace or no 24
volt power to integrated control
module
Blown fuse or tripped circuit
breaker
Integrated control module is non-
functional
Restore high voltage power to furnace and
integrated control module.
Replace non-functional integrated control module.
Furnace fails to operate
E0
Circulator blower motor is not
running when it should be running
Tighten or correct wiring connection
Verify continuous circuit through inductor
Replace if open or short circuit
Check circulator blower motor, replace if
necessary
Furnace fails to operate
E1
Integrated control module has
lost communications with
circulator blower motor
Tighten or correct wiring connection
Check circulator blower motor. Replace if
necessary
Check integrated control module, replace if
necessary
Furnace fails to operate
E2
Circulator blower motor horse
power in shared data set does
not match circulator blower
motor horse power.
Verify circulator blower motor horse power match
with nameplate, replace if necessary
Verify shared data set is correct for the specific
model, re-populate data using correct memory
card if required
Furnace operates at reduced
performance
Airflow delivered is less than
expected
E
Circulator blower motor is
operating in a power,
temperature, or speed limiting
condition
Check filters for blockage, clean filters or remove
obstruction
Check ductwork for blockage and verify all
registers are fully open
Verify ductwork is appropriately sized for system,
resize and/or replace ductwork if necessary
Furnace fails to operate
E
Circulator blower motor senses
a loss of rotor control
Circulator blower motor senses
high current
Check filters, filter grille, registers, duct system and
equipment inlet/outlet for blockage, make
necessary corrections and retest
Furnace fails to operate
E
Circulator blower motor fails to
start 10 consecutive times
Check circulating blower for obstructions
Repair or replace blower motor or wheel as
required
Check circulating blower shaft for proper rotation
Furnace fails to operate
E
Circulator blower motor shuts
down for over or under voltage
condition
Circulator blower motor shuts
down due to over temperature
condition on power module
Check voltage to furnace and verify within
nameplate specified range
Furnace fails to operate
E
Circulator blower motor lacks
information to operate properly
Motor fails to start 40
consecutive times
Check for locked rotor condition
Check integrated control module and verify it is
populated with the correct shared data