Installations Instructions

59
TROUBLESHOOTING CODES
Message Code
• • • •
Furnace fails to operate. Integrated control module LED display provides
b0
error code.
Comf ortNet th ermostat “ Call f or Service” icon illuminated. Comf ortNet th ermostat scrolls “Check Furnace” message.
b0
• Circulator blower
motor is not running when it should be running.
MOTOR
NOT RUN
b0 •
• •
Loose wiring connection at circulator motor power leads or 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.
• • •
Tighten or correct wiring connection. Verify continuous circuit through inductor. Replace if open or short circuit. Check circulator blower motor. Replace if necessary.
• • •
Turn power OFF prior to repair Replace inductor with correct replacement part. Replace circulator motor with correct replacement part.
• • • •
Furnace fails to operate. Integrated control module LED display provides
b1
error code.
Comf ortNet th ermostat “ Call f or Service” icon illuminated. Comf ortNet th ermostat scrolls “Check Furnace” message.
b1
• Integrated
control module has lost communications with circulator blower motor.
MOTOR
COMM
b1 •
• •
Loose wiring connection at circulator motor control leads. Failed circulator blower motor. Failed integrated control module.
• • •
Tighten or correct wiring connection. Check blower motor with UT T-01 Emerson tester Check integrated control module. Replace if necessary.
• • •
Turn power OFF prior to repair Replace circulator motor with correct replacement part. Replace integrated control module with correct replacement part.
• • • •
Furnace fails to operate. Integrated control module LE display provides
b2
error code.
Comf ortNet th ermostat “ Call f or Service” icon illuminated. Comf ortNet th ermostat scrolls “Check Furnace” message.
b2
• Circulator blower
motor horse power in sh ared data set does not match circulator blower motor horse power.
MOTOR
MISMATCH
b2 •
•
Incorrect circulator blower motor in furnace. Incorrect shared data set in integrated control module.
• •
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. Re-populate data using correct memory card if required.
• • • • • •
Turn power OFF prior to repair Replace motor with correct replacement part. Use memory card for the specific model Insert memory card BEFORE turning power ON. Memory card may be removed af ter data is loaded. Turn power OFF before removing memory card. Error code will be cleared once shared data and motor horse power match.
• • •
Furnace operates at reduced performance. Airflow delivered is less than expected. Integrated control module LED display provides
b3
error code.
b3
• Circulator blower
motor is operating in a power, temperature, or speed limiting condition.
MOTOR
LIMITS
b3 •
• • •
Blocked filters. Restrictive ductwork. Undersized d uctwork. High ambient temperatures.
• • • •
Check filters for blockage. Clean filters or remove obstruction. Check ductwork for blockage. Remove obstruction. Verify all registers are f ully open. Verify ductwork is appropriately sized for system. Resize/replace ductwork if necessary. See "Product Description" and "Location Requirements & Considerations" for furnace installation requirements.
• Turn power OFF prior to repair.
• • • •
Furnace fails to operate. Integrated control module LED display provides
b4
error code.
Comf ortNet th ermostat “ Call f or Service” icon illuminated. Comf ortNet th ermostat scrolls “Check Furnace” message.
b4
• •
Circulator blower motor senses a loss of rotor control. Circulator blower motor senses high current.
MOTOR
TRIPS
b4 •
•
Abnormal motor loading, sudden change in speed or torque, sudden blockage of f urnace air inlet or outlet. High loading conditions, blocked filters, very restrictive ductwork, blockage of f urnace air inlet or outlet.
• Check filters, filter grills/registers,
duct system, and furnace air inlet/outlet for blockages.
• Turn power OFF prior to repair.
Diagnostic
& Status
LED Codes
Fault
Description
Symptoms of Abnormal Operation
(Non-communicating
& ComfortNet™ T hermostat)
ComfortNet
Thermostat Only
Corrective Actions Notes & CautionsPossible Causes