Condensing Unit, Heat Pump, Blower and Coil Service Instructions

SERVICING
41
ComfortNet ™
Thermostat Only
Symptoms of Abnormal Operation
(Communicating & Non-communicating
Thermostat)
Diagnostic/Status
LED Codes
Fault Description
Message Code
Possible Causes Corrective Actions Notes & Cautions
x Air handler fails to operate.
x Integrated control module LED display
provides indicated error code.
x ComfortNet™ thermostat “Call for
Service” icon illuminated.
x ComfortNet thermostat scrolls “Check Air
Handler” message.
6 Flashes
x Circulator blower motor
fails to start 10
consecutive times.
MTR LCKD
ROTOR
b5
x Obstruction in circulator blower
housing.
x Seized circulator blower motor
bearings.
x Failed circulator blower motor.
x Check circulator blower for
obstructions. Remove and
repair/replace wheel/motor if
necessary.
x Check circulator blower motor
shaft rotation and motor.
Replace motor if necessary.
x Turn power OFF prior to
repair
x Replace motor with correct
replacement part.
x Replace wheel with correct
replacement part.
x Air handler fails to operate.
x Integrated control module LED display
provides indicated error code.
x ComfortNet thermostat “Call for Service”
icon illuminated.
x ComfortNet thermostat scrolls “Check Air
Handler” message.
6 Flashes
x Circulator blower motor
shuts down for over or
under voltage condition.
x Circulator blower motor
shuts down due to over
temperature condition on
power module.
MOTOR
VOLTS
b6
x High AC line voltage to air
handler.
x Low AC line voltage to air
handler.
x High ambient temperatures.
x Check power to air handler.
Verify line voltage to blower is
within the range specified on the
air handler rating plate.
x See "Installation Instructions" for
installation requirements.
x Turn power OFF prior to
repair.
x Air handler fails to operate.
x Integrated control module LED display
provides indicated error code.
x ComfortNet thermostat “Call for Service”
icon illuminated.
x ComfortNet thermostat scrolls “Check Air
Handler” message.
6 Flashes
x Circulator blower motor
does not have enough
information to operate
properly.
x Motor fails to start 40
consecutive times.
MOTOR
PARAMS
b7
x Error with integrated control
module.
x Motor has a locked rotor
condition.
x Check integrated control module.
Verify control is populated with
correct shared data set. See data
errors above for details.
x Check for locked rotor condition
(see error code above for
details).
x Turn power OFF prior to
repair.
x Replace with correct
replacement part(s).
x Use memory card for the
specific model.
x Air handler operates at reduced
performance or operates on low stage
when high stage is expected.
x Integrated control module LED display
provides indicated error code.
6 Flashes
x Airflow is lower than
demanded.
LOW ID
AIRFLOW
b9
x Blocked filters.
x Restrictive ductwork.
x Undersized ductwork.
x Check filters for blockage.
Clean filters or remove
obstruction.
x Check ductwork for blockage.
Remove obstruction. Verify all
registers are fully open.
x Verify ductwork is appropriately
sized for system. Resize/replace
ductwork if necessary.
x Turn power OFF prior to
repair.
PCBJA101- PCBJA102 AIR HANDLER DIAGNOSTIC CODES