Carrier air error codes

Carrier air conditioners are well-known throughout the world. The air conditioners of this make are distinguished by excellent ergonomics and high-performance level. The error codes for diagnostics of this equipment can be found below in the form of a table. The system can correct some breakings itself, but it does not help in all cases. Therefore, one should have such a table to hand. It allows to decipher any error code and assign repair.

Carrier 48VL-A air error codes

Air conditioners Carrier 48VL-A are single packaged air conditioners having the gas furnace system. They use R-410 A as refrigerant. These are heat/electric cooling systems which are able to use the comfort of gas heating packaged along with efficient electric air conditioning.

SYMPTOMCAUSEREMEDY
No Power or Hardware failure (LED OFF)Loss of power to control module (IGC).Check 5-amp fuse son IGC, power to unit, 24-v circuit breaker, and transformer. Units without a 24-v circuit breaker have an internal overload in the 24-v transformer. If the overload trips, allow 10 minutes for automatic reset.
Limit switch faults (LED 2 flashes)High temperature limit switch is open.Check the operation of the indoor (evaporator) fan motor. Ensure that the supply-air temperature rise is in accordance with the range on the unit nameplate. Clean or replace filters.
Flame sense fault (LED 3 flashes)The IGC sensed flame that should not be present.Reset unit. If problem persists, replace control board.
4 consecutive limit switch faults (LED 4 flashes)Inadequate airflow to unit.Check the operation of the indoor (evaporator) fan motor and that supply-air temperature rise agrees with range on unit nameplate information.
Ignition lockout fault (LED 5 flashes)Unit unsuccessfully attempted ignition for 15 minutes.Check ignitor and flame sensor electrode spacing, gaps, etc. Ensure that fame sense and ignition wires are properly terminated. Verify that unit is obtaining proper amount of gas.
Pressure Switch fault (LED 6 flashes)Open pressure switch.Verify wiring connections to pressure switch and inducer motor. Verify pressure switch hose is tightly connected to both inducer housing and pressure switch. Verify inducer wheel is properly attached to inducer motor shaft. Verify inducer motor shaft is turning.
Rollout switch fault (LED 7 flashes)Rollout switch has opened.Rollout switch will automatically reset, but IGC will continue to lockout unit. Check gas valve operation. Ensure that induced-draft blower wheel is properly secured to motor shaft. Inspect heat exchanger. Reset unit at unit disconnect.
Internal control fault (LED 8 flashes)Microprocessor has sensed an error in the software or hardware.If error code is not cleared by resetting unit power, replace the IGC.
Temporary 1 hr auto reset1 (LED 9 flashes)Electrical interference impeding IGC softwareReset 24-v. to control board or turn thermostat off, then on again. Fault will automatically reset itself in one (1) hour.

Carrier 50EJ air error codes

Air conditioners Carrier 50EJ are single-package rooftop units. They provide electric cooling with electric heat option. They have indoor sections and roof curbs, which are delivered disassembled. The refrigerant of the type R-22 is used in their system.

LED BLINKSERROR CODEDESCRIPTIONTROUBLESHOOTING COMMENTS
1Normal OperationThe expansion board and control board flash the red LED in one- second intervals when the board is operating properly.
2HF-13Compressor 1 SafetyThe high or low pressure safety switch for compressor no. 1 has opened for 3 seconds. The error will be cleared and compressor no. 1 will be allowed to turn on in 15 minutes. If the safeties have been tripped 3 times in 90 minutes, compressor no. 1 will be locked out until the control board has been manually reset.
3HF-14Compressor 2 SafetyThe high or low pressure safety switch for compressor no. 2 has opened for 3 seconds. The error will be cleared and compressor no. 2 will be allowed to turn on in 15 minutes. If the safeties have been tripped 3 times in 90 minutes, compressor no. 2 will be locked out until the control board has been manually reset.
4HF-15Thermostat FailureThe thermostat is calling for both heating and cooling at the same time. The unit will operate on a first call basis and will auto- matically reset.
5HF-05SAT Thermistor FailureThe supply-air temperature (SAT) sensor has failed. First check for wiring errors, then replace sensor.
6HF-06OAT Thermistor FailureThe outside-air temperature (OAT) sensor has failed. First check for wiring errors, then replace sensor.
7HF-03Space Temp. Sen. FailureThe space temperature sensor has failed. First check for wiring errors, then replace sensor.
8HF-12RAT Thermistor FailureThe return-air temperature (RAT) sensor has failed. Ensure that the unit is a VAV unit. If NOT a VAV unit set DIP switch position 1 to the closed position and reset power. Then check for wiring errors. Finally, replace sensor.
9SE-05Loss of Communications with Expansion boardCommunications between the expansion board and the control board have been interrupted. Ensure that an expansion board is installed and wired using the wire harness supplied with the expansion module. If an expansion board is not used ensure that DIP switch position 3 is in the closed position, and reset power.
10HF-16Control Board FailureGenerated when hardware has failed on control board. Replace the control board.
11HF-17Expansion Board FailureGenerated when hardware has failed on the expansion board. Replace the expansion board.

Carrier 50PD05 air error codes

Air conditioning equipment Carrier 50PD05 represent single package displacement ventilation
or single zone variable airflow rooftop units. They provide electric cooling and gas heating. The used refrigerant is R—410A.

ALARM OR ALERT NUMBERDESCRIPTIONACTION TAKEN BY CONTROLRESET METHODPROBABLE CAUSE
Digital Compressor Control Board AlarmNo actionAutomatic
Compressor A1 Safety TripAdd Strike for Circuit ACurrent Sensing turned on (CS.A1 = Enable) and should be off
T051Service Test Compressor A1 Safety Trip
Compressor A1 Current Detected After TurnoffTurn off all compressors
Service Test Compressor A1 Current Detected After Turnoff
T064Circuit A Saturated Condensing Temp Thermistor FailureUse OAT to control Outdoor fansFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T066Circuit A Saturated Suction Temperature Thermistor FailureNo CoolingSuction transducers internally forced inactive
T073Outdoor Air Temperature Thermistor FailureNo cooling with economizerFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T074Space Temperature Thermistor FailureNo heating or cooling
T075Supply Air Temperature Thermistor FailureNo cooling mode
T076Return Air Thermistor FailureNo differential DB crossover
T077Space Relative Humidity Sensor FailureIf RH.S = Yes. then no indoor humidity controlFaulty, shorted, or open sensor caused by wiring error or loose connection.
T092Circuit A Suction Pressure Transducer FailureShutdown Circuit AManualFaulty transducer, faulty 5-V power supply, or loose connection
T102Compressor A1 Current Sensor FailureIf CS.A1 = Enable, then no T051 current alarmAutomaticCurrent Sensing turned on (CS.A1 = Enable) and should be off
T110Service Test Circuit A Loss of ChargeShutdown Circuit AManualLow refrigerant or faulty suction pressure transducer
T126Circuit A High Discharge PressureAutomaticAn overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or a faulty high-pressure switch.
Service Test Circuit A High Discharge Pressure
T133Circuit A Low Refrigerant PressureAdd Strike for Circuit ALow refrigerant charge, dirty filters, evaporator fan turning backwards, loose or broken fan belt, plugged filter drier, faulty transducer, excessively cold return air, or stuck open economizer when the ambient temperature is low.
Service Test Circuit A Low Refrigerant Pressure
T143Service Test Circuit A Failure To PressurizeWiring causing reverse rotation or faulty compressor
T153Real Timedock Hardware FailureNo time and date schedule operationNo time/date configured, software failure, or MBB failure
A154Serial EEPROM Hardware FailureUnit ShutdownSoftware failure or MBB failure
T155Serial EEPROM Storage Failure ErrorUnit operation errors
A156Critical Serial EEPROM Storage Fail ErrorUnit Shutdown
A'D Hardware FailureManual
A163Circuit A Down Due to FailureShutdown Circuit ACircuit has 3 strikes or has been locked out by another alarm
Service Test Circuit A Down Due to FailureCircuit has 1 strike or has been locked out by another alarm
T178Loss of Communication with the Capacity Control BoardUnit shutdown -HVAC disableAutomaticCommunication wiring problem with AUX1 or faulty MBB. ECB. orAUXI
T179Loss of communication with the Economizer Control BoardNo economizer operationCommunication wiring problem with ECB or faulty MBB. ECB. orAUXI
T180Loss of communication with the Economizer ActuatorCommunication wiring problem with actuator.
A200Linkage Timeout Error Comm FailureNo Linkage Operation fall back to local SPTReceived a table write from Linkage before, now not receiving any linked commands
A404Fire ShutdownUnit ShutdownSmoke detected by smoke detector
T408Dirty FilterAlert GeneratedDirty Filter
T409Fan Status Switch ON. Fan Contactor OFFIf IDF.F = Yes, then Unit ShutdownIf IDF.F = YES, then Manual, otherwise automaticBad Fan Status Switch. Configuration incorrect.
Fan Status Switch OFF. Fan Contactor ONIf IDF.F = YES. then Manual, otherwise automaticTripped Circuit Breaker. Broken belt. Bad indoor fan motor. Configuration incorrect. Bad fan status switch.
T414Economizer Damper Actuator Out of CalibrationAlert GeneratedAutomaticCalibrate economizer (E.CAL). If problem still exist then determine what is limiting economizer rotation.
Economizer Damper Actuator Torque Above Load LimitActuator load too high. Check damper load.
Economizer Damper Actuator Hunting ExcessivelyDamper position changing too quickly.
Economizer Damper Stuck or JammedNo economizer motion. Check damper blades, gears, and actuator.
Economizer Damper Actuator Mechanical FailureCheck actuator and replace if necessary.
Economizer Damper Actuator Direction Switch WrongActuator direction control switch (CCW, CW) wrong.
T415IAQ Input Out of RangeNo IAQ OperationsBad sensor, bad wiring, or sensor configured incorrectly.
T416OAQ Input Out of RangeBad sensor, bad wiring, or sensor configured incorrectly.

Carrier xpower Blue II 42KCL109313G air error codes

Air conditioning equipment Carrier xpower Blue II 42KCL109313G belongs to inverter series. These units have indoor and outdoor blocks. They do not provide heating function. The refrigerant that can be used in their system is R410A.

DisplayLED STATUS
EOEEPROM parameter error
E1Indoor unit and outdoor unit communication protection
E2Zero-crossing signal error
E3Indoor fan speed has been out of control
E5Open or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error
E6Open or short circuit of room or evaporator coil temperature sensor
POIPM malfunction or IGBT over-strong current protection
P1Over voltage or too low voltage protection
P2Temperature protection of compressor top.
P4Inverter compressor drive error

Carrier MOTORMASTER 4850P3 air conditioner error codes

Air conditioners Carrier MOTORMASTER 4850P3 belong to low ambient operation units. They are fit with MOTORMASTER V control accessory, which makes its control more comfortable and convenient.

CODEDESCRIPTIONRESET METHODPROBABLE CAUSECORRECTIVE ACTION
AFHigh Temperature FaultAutomaticAmbient temperature is too high; Cooling fan has failed (if equipped).Check cooling fan operation.
CFControl FaultManualA blank EPM, or an EPM with corrupted data has been installed.Perform a factory reset using Parameter 48 PROGRAM SELECTION.
cFIncompatibility FaultAn EPM with an incompatible parameter version has been installed.Either remove the EPM or perform a factory reset (Parameter 48) to change the parameter version of the EPM to match the parameter version of the drive.
F1EPM FaultThe EPM is missing or damaged.Install EPM or replace with new EPM.
F2—F9 FoInternal FaultsThe control board has sensed a problemConsult factory.
GFData FaultUser data and Carrier defaults in the EPM are corrupted.Restore factory defaults by toggling P48 to another mode. Then set P48 to desired mode to restore all defaults for that mode. If that does not work, replace EPM.
HFHigh DC Bus Voltage FaultAutomaticLine voltage is too high; Deceleration rate is too fast; Overhauling load.Check line voltage — set P01 appropriately.
JFSerial FaultThe watchdog timer has timed out, indicating that the serial link has been lost.Check serial connection (computer). Check settings for P15.
Check settings in communication software to match P15.
LFLow DC Bus Voltage FaultLine voltage is too low.Check line voltage — set P01 appropriately.
OFOutput Transistor FaultPhase to phase or phase to ground short circuit on the output; Failed output transistor; Boost settings are too high; Acceleration rate is too fast.Reduce boost or increase acceleration values. If unsuccessful, replace drive.
PFCurrent Overload FaultVFD is undersized for the application; Mechanical problem with the driven equipment.Check line voltage set P01 appropriately.
Check for dirty coils.
Check for motor bearing failure.
SFSingle-phase FaultSingle-phase input power has been applied to a three-phase drive.Check input power phasing.
Drive displays “—“ even though drive should be runningStart Contact is Not ClosedStart contact is missing or not functioning.Check fan relay.
VFD flashes “---” and LCSStart contact not closed.Check FR for closed contact.
VFD flashes 57 (or 47) and LCSSpeed Signal LostSpeed signal lost. Drive will operate at 57 (or 47) Hz until reset or loss of start command. Resetting requires cycling start command (or power).Transducer signal lost. Check VDC signal between TB5 and TB2. Should be in range of 0.5V to 4.5V. 5VDC output should be present between TB6 and TB2.

Carrier GEMINI 38APD025-100 air conditioner error codes

Air conditioning equipment Carrier GEMINI 38APD025-100 represents commercial air-cooled condensing units with COMFORTLINK controls. Each unit has its display module. It is used for accessing unit information, reading sensor values and testing the unit.

ALARM/ ALERT CODEALARM OR ALERTDESCRIPTIONWHY WAS THIS ALARM GENERATED?ACTION TAKEN BY CONTROLRESET METHOD
T048AlertCircuit A Compressor Availability AlertTwo compressors on circuit failedCircuit shut downManual
T049Circuit B Compressor Availability AlertTwo compressors on circuit failed
T051.T052, T053Circuit A Compressor A1 .A2.A3 FailureRespective current sensor board (CSB) feedback signal does not match relay stateRespective compressor shut down in Circuit A.
TOSS, T056, T057Circuit B Compressor B1 .B2.B3 FailureRespective compressor shut down in Circuit B.
A051, A052, A053AlarmCircuit A Compressor A1 .A2.A3 FailureRespective current sensor board (CSB) feedback signal is ON when the compressor should be offUnit shut down
A055, A056, A057Circuit B Compressor B1 .B2.B3 Failure
A060Supply Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)Automatic
A060Supply Air Temperature Update not receivedTemperature not updated during 3 minutes
A061Return Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)
A061Return Air Temperature Update not receivedTemperature not updated during 3 minutes
T068AlertCircuit A Return Gas Thermistor FailureThermistor is outside range of -40 to 245 F (-40 to 118 C)Circuit shut down
T069Circuit B Return Gas Thermistor Failure
T073Outside Air Thermistor FailureTemperature reset disabled. Unit runs under normal control/set points.
T074Space Temperature Thermistor Failure
T090Circuit A Discharge Pres- sure Transducer FailureThe pressure is outside the range of 0.0 to 667.0 psigCircuit A shut down
T091Circuit B Discharge Pres- sure Transducer FailureCircuit B shut down
T092Circuit A Suction Pressure Transducer FailureThe pressure is outside the range of 0.0 to 420.0 psigCircuit A shut down
T093Circuit B Suction Pressure Transducer FailureCircuit B shut down
T094Discharge Gas Thermistor FailureDischarge thermistor (DTT) is either open or shortedDigital compressor shut down.
T110Circuit A Loss of ChargeIf the compressors are off and discharge pressure reading is less than 26 psig for 30 sec.Circuit not allowed to start.Manual
T111Circuit B Loss of Charge
T112Circuit A High Saturated Suction TemperatureCircuit is on and saturated suction temperature is greater than 70 F (15.6 C) for 5 minutesCircuit shut down
T113Circuit B High Saturated Suction TemperatureCircuit is on and saturated suction temperature is greater than 70 F (15.6 C) for 5 minutes
T114Circuit A Low Suction SuperheatSuction superheat is less than 5 F (2.8 C) for 5 minutes.Circuit A is shut down after pump down complete.Automatic after first daily occurrence, manual thereafter
T115Circuit B Low Suction SuperheatSuction superheat is less than 5 F (2.8 C) for 5 minutes.Circuit B is shut down after pump down complete.
T118High Discharge Gas TemperatureDischarge Thermistor (DTT) reading is greater than 250 FCompressor A1 shutdownAutomatic
A118Alarm3 Discharge Gas Temperature alarms occur within a dayCompressor A1 shutdownManual
P120AlertCircuit A Low Saturated SuctionSSTA is less than 20 F for 4 minutes, less than 10 F for 2 minutes, less than 0° F for 1 minute or less than -20 F for 20 seconds continuouslyCircuit A will remove one compressor stage.Automatic
T120Circuit A shut downAutomatic unless 3rd strike.
A120AlarmManual
P121AlertCircuit B will remove one compressor stage.Automatic
T121Circuit B Low Saturated SuctionCircuit B shut downAutomatic unless 3rd strike.
A121AlarmManual
T122AlertHigh Pressure Switch Trip Circuit AHigh Pressure A Switch Input open to MBBCircuit shut down
T123High Pressure Switch Trip Circuit BHigh Pressure B Switch Input open to MBB
T126Circuit A High Discharge PressureSCTA >150 FAutomatic, only after first 3 daily occurrences.
A126AlarmManual
T127AlertCircuit B High Discharge PressureSCTB >150 FAutomatic, only after first 3 daily occurrences
A127AlarmCircuit B High Discharge PressureSCTB >150 FManual
A140Reverse Rotation DetectedIncoming unit power leads not phased correctlyUnit shut down.
A150Emergency StopCCN emergency stop command receivedUnit shutdown without going through pump down.Automatic once CCN command for EMSTOP returns to normal
A151Illegal ConfigurationOne or more illegal configurations exists.Unit is not allowed to start.Manual once configuration errors are corrected
T153AlertReal Time Clock Hardware FailureInternal clock on MBB failsOccupancy schedule will not be used. Unit defaults to Local On mode.Automatic when correct clock control restarts.
A154AlarmSerial EEPROM Hardware FailureHardware failure with MBBUnit is unable to run.Manual
T155AlertSerial EEPROM Storage FailureConfiguration/storage failure with MBBNo action
A156AlarmCritical Serial EEPROM Storage FailureUnit is not allowed to run.
A157A/D Hardware FailureHardware failure with peripheral device
A170Loss of Communication with CXBMBB loses communication with CXBCXB functions disabledAutomatic
A173Loss of Communication with EMMMBB loses communication with EMM4 to 20 mA temperature reset disabled. Demand Limit set to 100%. 4 to 20 mA set point disabled.
T174Alert4 to 20 mA Cooling Set Point/Desired % Capacity Input FailureIf configured with EMM and input less than 2 mA or greater than 22 mASet point function/% capacity function disabled.
T1764 to 20 mA Temperature Reset Input FailureReset function disabled. Unit returns to normal set point control.
T1774 to 20 mA Demand Limit Input FailureDemand limit function disabled. Unit returns to 100% demand limit control.
A200AlarmFan Status Switch 1 OpenAlarm is generated when fan status switch 1 is open when the unit is in an ON stateUnit not allowed to start
T201AlertFan Status Switch 1 is open with Dual TSTAT configurationAlert is generated when fan status switch 1 is open when Y1 or Y2 are closedCircuit A is not allowed to run
T202Fan Status Switch 2 is open with Dual TSTAT configurationAlert is generated when fan status switch 1 is open when Y3 or Y4 are closed
T303Condenser Coil Maintenance DueCoil Service Countdown (C.L.DN) expired. Complete condenser coil cleaning and enter 'YES’ for Coil Maintenance Done (C.L.MN) item.None
T500Current Sensor Board A1 FailureAlert occurs when CSB output is a constant high valueCompressor A1 shut down
T501Current Sensor Board A2 FailureCompressor A2 shut down
T502Current Sensor Board A3 FailureCompressor A3 shut down
T503Current Sensor Board B1 FailureCompressor B1 shut down
T504Current Sensor Board B2 FailureCompressor B2 shut down
T505Current Sensor Board B3 FailureCompressor B3 shut down

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