Climate Talk Fault Code	Dealer error message	Possible Causes	Corrective Actions	Alarm Status	Unit Type	Consumer error message	Notes
A0	A2L refrigerant leakage alarm			Critical	AHU	System error
A1	A2L sensor internal alarm			Critical	AHU	System error
A2	A2L relay alarm			Critical	AHU	System error
AF	A2L sensor communication alarm			Critical	AHU	System error
B0	Blower motor not running	•Loose wiring connection at circulator motor power leads or circulator power leads disconnected. •Open circuit in inductor or loose wiring connection at inductor(3/4 Hp & 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.	Critical	furnace	Fan Failure
B1	Blower 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 circulator integrated control module.  Replace if necessary	Critical	furnace	Communication Error
B2	Blower motor HP mismatch	•Incorrect circulator blower motor in furnace. •Incorrect shared data set in integrated control module.	•Verify circulator blower if 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.	Critical	furnace	Fan Failure
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 obstructions. •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 "III. Product Description" and "IV. Location Requirements & Considerations" furnace installation requirements.	Critical	furnace	Fan Failure
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 obstructions. •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 "Product description" and "Location Requirements & Considerations" for furnace installation requirements.	minor	furnace	Fan Failure
B4	Blower motor current trip or lost rotor position	•Abnormal  motor loading, sudden change in speed or torque, sudden blockage of furnace air inlet or outlet.	•Check filters, filter grills/registers, duct system, and furnace air inlet/outlet for blockages.	Critical	furnace	Fan Failure
B5	Blower motor locked rotor	•Obstruction in circulator blowing housing •Seized circular blower motor bearings •Failed circular blower motor	•Check circulator blower for obstructions.  Remove and repair/replace wheel/motor if necessary.  •Check circular blower motor shaft rotation and motor.  Replace motor if necessary.	Critical	furnace	Fan Failure
B6	Voltage or temperature trip	•High AC line voltage to furnace •Low AC line voltage to furnace •High ambient temperatures	•Check power to furnace.  Verify line voltage to furnace is within the range specified on the furnace rating plate. •See"III. Product Description" and "IV. Location Requirements & Considerations" furnace installation requirements.	Critical	furnace	System error
B7	Incomplete parameters sent to motor	•Error with integrated control module •Motor has a 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	furnace	System error
B9	Low indoor airflow	•Blocked filters •Restrictive ductwork •Undersized ductwork	•Check filter for blockage.  Clean filters or remove obstructions. •Check ductwork for blockage.  Remove obstructions.  Verify all registers are fully open. •Verity ductwork is appropriately sized for system.  Resize/replace ductwork if necessary	minor	furnace	Fan Failure error
BF	Inducer Communication Alarm			Critical	furnace	System error
C0	Unit Missing			Critical	furnace	System error
C1	ClimateTalk Network Communication Alarm			Critical	furnace	System error
C2	Unrecognized Command			Critical	furnace	System error
C3	Unrecognized Data ID			Critical	furnace	System error
C4	Invalid DataAC Downloaded Shared Data			Critical	furnace	System error
C5	Invalid Downloaded Firmware			Critical	furnace	System error
D0	Data not yet on network	•Furnace does not contain any shared data	•Populate shared data set using memory card	Critical	furnace	System error
D1	invalid data on network	•Air conditioner is wired as part of a communicating system and integrated control module does contain any shared data	•Replace control board if necessary	Critical	furnace	System error
D2	Invalid system combination			Critical	furnace	System error
D4	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 is required.	Critical	furnace	System error
D5	No Cooling Unit Installed			minor	furnace	System error
D6	No De-Humidifier Installed			minor	furnace	System error
D7	Wrong Legacy T-Stat Setup Alarm			minor	furnace	System error
E0	Lockout due to excessive ignition attempts	•Failure to establish flame.  Cause may be no gas to burners, front cover pressure switch stuck open, bad igniter or igniter alignment, improper orifices, or coated/oxidized or improperly connected flame sensor. •Loss of flame after establishment.  Cause may be interrupted gas supply, lazy burner flames (improper gas pressure or restriction in fuel and/or combustion air piping), front cover pressure switch opening, or improper induced draft blower performance.	•Locate and correct gas interruption. •Check front cover pressure switch operation (hose, wiring, contact operation).  Correct if necessary. •Replace or realign igniter. •Check flame sensor signal.  Clean sensor if coated and/or oxidized. •Check fuel piping for blockage, proper length, elbows, and termination. •Verify proper induced draft blower performance.	Critical	furnace	System error
E1	Low stage pressure switch closed at start of heating	•Low stage pressure switch contacts sticking. •Shorts in pressure switch circuit wiring.	•Preplace low stage pressure switch. •Repair short in wiring.	Critical	furnace	Pressure error
E2	Low stage pressure switch open during heating	•Pressure switch hose blocked, pinched, or connected improperly. •Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower. •Incorrect pressure switch set point or malfunctioning switch contacts. •Loose or improperly connected wiring.	•Inspect pressure switch hose.  Repair/replace if necessary. •Inspect flue and/or inlet air piping for blockage, proper length, elbows, and termination.  Check drain system.  Correct as necessary. •Correct pressure switch set point or contact motion. •Tighten or correct wiring connection.	Critical	furnace	Pressure error
E3	Open high limit switch	•Insufficient conditioned air over the heat exchanger.  Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower motor. •Flame rollout. •Misaligned burners, blocked fuel and/or air inlet pipe, or failed induced draft blower. •Loose or improperly connected wiring.	•Check filters and ductwork for blockage.  Clean filters or remove obstruction. •Check circulator blower speed and performance.  Correct speed or replace blower motor if necessary. •Check burners for proper alignment. •Check fuel and air inlet piping for blockage, proper length, elbows, and termination.  Correct if necessary. •Check induced draft blower for proper performance.  Replace if necessary. •Tighten or correct wiring connection.	Critical	furnace	System error
E4	Flame detected when no flame should be present	•Short to ground in flame sensor circuit. •Lingering burner flame. •Slow closing gas valve.	•Correct short at flame sensor or in flame sensor wiring. •Check for lingering flame. •Verify proper operation of gas valve.	Critical		System error
E5	Blown fuse on PCB	•Short in low voltage wiring.	•Locate and correct short in low voltage wiring.	Critical		System error
E6	Low flame signal	•Flame sensor is coated/oxidized. •Flame sensor incorrectly positioned in burner flame. •Lazy burner flame due to improper gas pressure or combustion sir.	•Clean flame sensor if coated/oxidized. •Check inlet air piping for blockage, proper length, elbows. And termination. •Compare current gas pressure to rating plate.  Adjust if needed. •Inspect for proper sensor alignment.	Critical		System error
E7	Igniter fault or improper grounding	•Improperly connected igniter. •Shorted igniter. •Poor unit ground. •Igniter relay fault on integrated control module.	•Check and connect wiring from integrated control module to igniter. •Replace shorted igniter. •Check & correct unit ground wiring. •Check igniter output from control.  Replace if necessary.	Critical		System error
E8	High stage pressure switch stuck closed	•High stage pressure switch contacts sticking. •Shorts in pressure switch circuit wiring.	•Replace high stage pressure switch. •Repair short in wiring.	Critical		Pressure error
E9	High stage pressure switch stuck open	•Pressure switch hose blocked, pinched, or connected improperly. •Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower. •Incorrect pressure switch set point or malfunctioning switch contacts. •Loose or improperly connected wiring.	•Inspect pressure switch hose.  Repair/replace if necessary. •Inspect flue and/or inlet air piping for blockage, proper length, elbows, and termination.  Check drain system.  Correct as necessary. •Correct pressure switch set point or contact motion. •Tighten or correct wiring connection.	Critical		Pressure error
EA	Reversed 115VAC polarity	•Polarity of 115 volt AC power to furnace or integrated module is reversed. •Poor unit ground.	•Review wiring diagram to correct polarity. •Verify proper ground.  Correct if necessary. •Check and correct wiring.	Critical		System error
EB	Internal Gas Valve Error			Critical		System error
EC	External Gas Valve Error			Critical		System error	ULN furnace only, keyed off of “ctIFCNoofGasHeatStages”  = '1';
EC	Inducer motor current fault	•Lingering Inducer motor overcurrent detected.	•Reset system power and verify inducer is running properly. •Replace inducer or integrated control module, if necessary.	Critical		System error	Other furnaces, keyed off of “ctIFCNoofGasHeatStages”  > '1';  This will change in the future when other Comforbridge furnace boards are rolled into the Daikin line.
ED	Flame rollout switch is open	•Orifice plate out of position. •Blocked heat exchanger. •Burners out of alignment. •Defective heat exchanger.	•Line up orifice plate. •Remove blockage from heat exchanger. •Line up burners. •Check for flame disturbance on roll out when burner comes on.	Critical		System error
EE	Internal Control Fault			Critical		System error
EF	Auxiliary input open	•High water level in the evaporation coil.	•Check overflow pan and service.	Critical		System error
10	Grounding Error			Critical		System error
11	Rollout Switch Open			Critical		System error
12	Redundant Relay Open Alarm			Critical		System error
13	Redundant Relay Stuck Close Alarm			Critical		System error
14	Read or Write to External Flash Fails			Critical		System error
15	RAT Sensor Open			minor		Sensor error
16	RAT Sensor Short			minor		Sensor error
17	SAT Sensor Open			minor		Sensor error
18	SAT Sensor Short			minor		Sensor error
19	Board Temperature Sensor Open			minor		System error
1A	Board Temperature Sensor Short			minor		System error
1B	APS Refence Error			Critical		System error
1C	APS Null Error			Critical		System error
1D	APS Span Error			Critical		System error
1E	APS Pressure Error			Critical		System error
1F	APS Input Error			Critical		System error
76	Equipment communication loss			Critical		Communication Error
77	Thermostat communication loss			Critical		Communication Error
78	Need to connect outdoor unit			Critical		System Error