Climate Talk Fault Code Transmitted message Dealer error message Possible Causes Corrective Actions Alarm Status Unit Type Consumer error message
               
            AHU  
b0 MOTOR NOT RUN Blower motor not running. •Loose wiring connection at circulator motor power leads or circulator motor power leads disconnected.
•Failed circulator blower motor.
•Tighten or correct wiring connection.
•Check circulator blower motor. Replace if necessary.
Critical AHU  Fan Failure error
b1 MOTOR COMM Blower motor communication error. •Loose wiring connection at circulator motor control leads.
•Failed circulator blower motor.
•Failed integrated control module.
•Tighten or correct wiring connection.
•Check circulator blower motor. Replace if necessary.
•Check integrated control module. Replace if necessary.
Critical AHU Fan Failure error
b2 MOTOR MISMATCH Blower motor horse power mismatch. •Incorrect circulator blower motor in air handler blower.
•Incorrect shared data set in integrated control module.
•Verify circulator blower motor horsepower is the same specified for the specific air handler blower model. Replace if necessary.
•Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Critical AHU Fan Failure error
b3   Blower motor is operating in a power, temperature, or speed limiting condition. •Fan/motor obstruction or blocked filters.
•Power interruption (low voltage).
•Incorrect Wiring.
•Blockage in the airflow (ductwork) or ductwork undersized.
•Check for obstruction on the fan/motor/ductwork, clean filters.
•Verify the input voltage at the motor.
•Check wiring.
•Replace motor.
Minor AHU Fan Failure error
b3   Blower motor is operating in a power, temperature, or speed limiting condition. •Blocked filters.
•Restrictive ductwork.
•Undersized ductwork.
•High ambient temperatures.
•Check filters for blockage. Clean filters 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.
•See "Installation Instructions" for installation requirements.
Critical AHU Fan Failure error
b4 MOTOR TRIPS Blower motor current trip or lost rotor position. •Abnormal motor loading, sudden change in speed or torque, sudden blockage of air handler blower/coil air inlet or outlet.
•High loading conditions, blocked filters, very restrictive ductwork, blockage of air handler blower/coil air inlet or outlet.
•Check filters, filter grills/registers, duct system, and air handler blower/coil air inlet/outlet for blockages. Critical AHU Fan Failure error
b5 MTR LCKD ROTOR Blower motor locked rotor. •Obstruction in circulator blower housing.
•Seized circulator blower motor bearings.
•Failed circulator blower  motor.
•Check circulator blower for obstructions. Remove and repair/replace wheel/motor if necessary.
•Check circulator blower motor shaft rotation and motor. Replace if necessary.
Critical AHU Fan Failure error
b6 MOTOR VOLTS Blower motor voltage or temperature trip. •High AC line voltage to air handler blower.
•Low AC line voltage to air handler blower.
•High ambient temperatures.
•Check power to air handler blower. Verify line voltage to blower is within the range specified on the air handler blower rating plate.
•See "Installation Instructions" for installation requirements.
Critical AHU Fan Failure error
b7 MOTOR PARAMS ID blower motor does not have the required parameters to function. •Error with integrated control module.
•Motor has locked rotor condition.
•Check integrated control module. Verify control is populated with correct shared data set. See data errors above for details.
•Check for locked rotor condition (see error code above for details).
Critical AHU Fan Failure error
b9 LOW ID AIRFLOW Low indoor airflow (without electric heat mode). •Blocked filters.
•Restrictive ductwork.
•Undersized ductwork.
•Check filters for blockage. Clean filters 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.
minor AHU Fan Failure error
d0 NO NET DATA No shared data on network. •Air handler blower does not contain any shared data. •Populate shared data set using memory card. Critical AHU System error
d1 INVALID DATA Incorrect shared data on network. •Air handler blower does not contain an appropriate shared data set. •Populate correct shared data set using memory card. Critical AHU System error
d4 INVALID MC DATA Invalid memory card data. •Shared data set on memory card has been rejected by integrated control module. •Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required. Critical AHU System error
Eb CONFIG HEAT KIT Heater kit called when no heater kit (fan may blow cold air). •No heater kit selected. •Select the valid heater kit on thermostat.
•Valid dip switch selection (heater kit selection out of range of the unit configuration).
minor AHU System error
Ed   Heater kit dip switches not set correctly. •Invalid heater kit selected. •Set correct dip switches. Critical AHU System error
EC HTR TOO LARGE Heater kit is too small or mismatched. •Heater kit selected via dipswitches is too small for heater kits in shared data set.
•Heater kit selected via dipswitches doesn't match heater kits in shared data set.
•Verify electric heat dipswitch settings.
•Verify the installed electric heater is valid for the air handler blower. Check nameplate or Specification Sheet applicable to your model* for allowable heater kit(s).
•Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Minor AHU System error
EC HTR TOO LARGE Heater kit selected is too large. •Heater kit selected via dipswitches is too large for heater kits in shared data set. •Verify electric heat dipswitch settings.
•Verify the installed electric heater is valid for the air handler blower. Check nameplate or Specification Sheet applicable to your model* for allowable heater kit(s).
•Verify shared data set is correct for the specific model. Re-populate data using correct memory card if required.
Critical AHU System error
EE INTERNAL FAULT Internal fault (incorrect PCB operation). •Manual disconnect switch OFF or 24 volt wire improperly connected or loose.
•Blown fuse or circuit breaker.
•Integrated control module has an internal fault.
•Assure 208/230 volt and 24 volt power to air handler blower and integrated control module.
•Check integrated control module fuse (3A). Replace if necessary.
•Check for possible shorts in 208/230 volt and 24 volt circuits. Repair as necessary.
•Replace bad integrated control module.
Critical AHU System error
EF AUX ALARM FAULT Auxiliary contacts open. •High water level in the evaporation coil. •Check overflow pan and service. Critical AHU System error
E5   Blown fuse on PCB. •Fuse (F1U) is blown.
•Connector TB10 is open.
•Replace fuse.
•Check wiring to AUX alarm, heater kit, communication connection.
Critical AHU System error
9b   Low indoor airflow (with electric heat mode). •Fan/motor obstruction or blocked filters.
•Restrictive ductwork or ductwork undersized.
•ID motor failure.
•Combination mistake outdoor unit and indoor unit.
•Check for obstruction on the fan/motor.
•Check ductwork/filter for blockage, clean filters.
•Remove obstruction. Verify all registers are fully open.
•Check the connections and the rotation of the motor.
•Verify the input voltage at the motor.
•Verify ductwork is appropriately sized for system. Resize/replace ductwork if needed.
•Replace motor
Critical AHU Fan Failure error
77   Thermostat communication loss during startup & operation. •Incorrect wiring between ID unit and thermostat.
•Thermostat failure.
•Power interruption (low voltage).
•Check for thermostat and indoor unit wiring.
•Verify the input voltage of the pressure sensor (refer to service manual).
•Replace pressure sensor.
Replace the control board.
Critical AHU  Communication error
70   EEV open circuit( incorrect wiring or not connected). •Indoor EEV coil not connected.
•Incorrect wiring to EEV.
•Check indoor EEV coil connection (PCB and junction connector).
•Replace EEV coil.
•Check the resistance value of EEV coil (refer to service manual).
•Replace the control board.
Critical AHU System error
73   Liquid side temperature fault. •Open (or) short circuit of the liquid thermistor (X5A).
•Liquid thermistor reading incorrect or values outside normal range.
•Check the connection to the liquid thermistor (PCB and junction connector).
•Check the resistance value of the thermistor (refer to service manual).
•Replace thermistor.
•Replace the control board.
Critical AHU Sensor error
74   Gas side temperature fault. •Open (or) short circuit of the gas thermistor (X5A).
•Gas thermistor reading incorrect or values outside normal range.
•Check the connection to the gas thermistor (PCB and junction connector).
•Check the resistance value of the thermistor (refer to service manual).
•Replace thermistor.
•Replace the control board.
Critical AHU Sensor error
75   Pressure sensor fault. •Open (or) short circuit of the pressure sensor (X15A).
•Pressure sensor reading incorrect or values outside normal range.
•Check the connection to pressure sensor (PCB and junction connector).
•Check the output voltage of the pressure sensor (refer to service manual).
•Replace pressure sensor.
•Replace the control board.
Critical   Pressure error