Intertek ACVC96 Service Instructions Manual page 49

TROUBLESHOOTING
Symptoms of Abnormal
Diagnostic/
Operation (Legacy
Status LED
& ComfortNet™
Codes
Thermostat)
b4
• Furnace fails to operate.
• Integrated control
module LED display
provides b4 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate.
b5
• Integrated control
module LED display
provides b5 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate. b6
• Integrated control
module LED display
provides b6 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace fails to operate. b7
• Integrated control
module LED display
provides b7 error code.
• ComfortNet™ thermostat
"Call for Service" icon
illuminated.
• ComfortNet™ thermostat
scrolls "Check Furnace"
message.
• Furnace operates at b9
reduced performance or
operates on low stage
when high stage is
expected.
• Integrated control
module LED display
provides b9 error code.
ComfortNet™
Thermostat Only
Fault Description
Message
•
Circulator blower
MOTOR
motor senses
TRIPS
a loss of rotor
control.
• Circulator blower
motor senses
high current.
MOTOR LCKD
• Circulator blower
ROTOR
motor fails to start
10 consecutive
times.
MOTOR
•
Circulator blower
VOLTS
motor shuts down
for over or under
voltage condition.
•
Circulator blower
motor shuts
down due to
over temperature
condition on
power module.
• MOTOR
Circulator blower
PARAMS
motor does not
have enough
information to
operate properly.
Motor fails to start
40 consecutive
times.
• LOW ID
Airflow is lower
AIRFLOW
than demanded.
Possible Causes
Code
b4
b5
b6
•
•
b7
•
B9 • Blocked filters.
• Restrictive ductwork.
• Undersized ductwork.
Corrective Actions Notes & Cautions
• Turn power OFF prior
to repair
• Turn power OFF prior
to repair.
• Replace motor with
correct replacement
part.
•
• Replace wheel with
correct replacement
part.
• Turn power OFF prior
to repair
•
•
•
• Check filters for • Turn power OFF prior
blockage. Clean filters
to repair.
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.
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