Intertek ACVC96 Service Instructions Manual page 48

TROUBLESHOOTING
Symptoms of Abnormal
Diagnostic/
Operation (Legacy
Status LED
& ComfortNet™
Codes
Thermostat)
• Operation different than
expected or no operation.
• Integrated control
module LED display
provides d4 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate.
• Integrated control
module LED display
provides b0 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate.
• Integrated control
module LED display
provides b1 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate.
• Integrated control
module LED display
provides b2 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace operates at
reduced performance.
• Airfow delivered is less
than expected.
• Integrated control
module LED display
provides b3 error code.
48
ComfortNet™
Thermostat Only
Fault Description
Message
d4 • Invalid memory INVALID MC
card data. DATA
b0 • Circulator blower MOTOR NOT
motor is not RUN
running when it
should be running.
b1 • Integrated control MOTOR
module has lost COMM
communications
with circulator
blower motor.
b2 • Circulator blower MOTOR
motor horse MISMATCH
power in shared
data set does not
match circulator
blower motor
horse power.
b3 • Circulator blower MOTOR
motor is operating LIMITS
in a power,
temperature, or
speed limiting
condition.
Possible Causes
Code
d4 • Shared data set on • Verify shared data set is
memory card has been
rejected by integrated
control module
b0 • Loose wiring connection • Tighten or correct wiring
at circulator motor
power leads or
• Verify continuous
circulator motor power
leads disconnected.
• Open circuit in inductor
or loose wiring
• Check circulator blower
connection at inductor
(3/4 Hp and 1 Hp
models only).
• Failed circulator blower
motor.
b1 • Loose wiring connection • Tighten or correct wiring
at circulator motor
control leads.
• Check circulator blower
• Failed circulator blower
motor.
• Failed integrated control • Check integrated control
module.
b2 • Incorrect circulator • Verify circulator blower if
blower motor in furnace.
• Incorrect shared data
set in integrated control
module.
• Verify shared data set is
b3 • Blocked flters. • Check flters for
• Restrictive ductwork.
• Undersized ductwork.
• Check ductwork for
• High ambient
temperatures.
• Verify ductwork is
• See "III. Product
Corrective Actions Notes & Cautions
• Turn power OFF prior
correct for the specifc to repair
model. Re-populate data
• Use memory card for
using correct memory
the specifc model.
card if required.
• Insert memory card
BEFORE turning
power ON. Memory
card may be removed
after data is loaded
and power is turned
off.
• Error code will be
cleared once data is
loaded and power is
turned off.
• Turn power OFF prior
connection. to repair
• Replace inductor with
circuit through inductor. correct replacement
Replace if open or short part.
circuit.
• Replace circulator
motor with correct
motor. Replace if replacement part.
necessary.
• Turn power OFF prior
connection. to repair
• Replace circulator
motor. Replace if motor with correct
necessary. replacement part.
• Replace integrated
module. Replace if control module with
necessary. correct replacement
part.
• Turn power OFF prior
motor horse power is the to repair
same specifed for the
• Replace motor with
specifc furnace model.
correct replacement
Replace if necessary.
part.
• Use memory card for
correct for the specifc
the specifc model
model. Re-populate data
• Insert memory card
using correct memory
BEFORE turning
card if required.
power ON. Memory
card may be removed
after data is loaded
and power is turned
off.
• Error code will be
cleared once shared
data and motor horse
power match.
• Turn power OFF prior
blockage. Clean flters to repair.
or remove obstruction.
blockage. Remove
obstruction. Verify all
registers are fully open.
appropriately sized for
system. Resize/replace
ductwork if necessary.
Description" and "IV .
Location Requirements
& Considerations"
furnace installation
requirements.