Carrier Elite air conditioner error codes

The Carrier brand was created in 1915 by Willis Carrier, the American engineer, who invented the modern air conditioning. Back then the name of the company was Toyo Carrier. Although the company’s country of origin is Japan, today it is headquartered in Farmington, Connecticut. Carrier is a part of the United Technologies Corporation, which acquired this brand in 1979. Air conditioning systems have always been its main focus, as well as commercial refrigeration systems.
If your Carrier Elite air conditioner displays an error code, then this page is exactly what you need: you will find out the explanation of all the fault codes.

Carrier Elite 025N-1, 035N-1, 045N-1, 055N-1, 065N-1, 075N-1 Series

Indoor Unit Error Display

Display LED STATUS
E0EEPROM parameter error
E1 Indoor unit and outdoor unit communication protection
E2 Zero-crossing signal error
E3 Indoor fan speed has been out of control
E5 Open or short circuit of outdoor temperature sensor or outdoor unit
EEPROM parameter error
E6 Open or short circuit of room or evaporator coil temperature sensor
E7Outdoor fan speed has been out of control
P0 IBM malfunction or IGBT over-strong current protection
P1 Over voltage or too low voltage protection
P2Temperature protection of compressor top.
P4 Inverter compressor drive error

Carrier MOTORMASTER 4850P3 air conditioner error codes

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. See Drive Programming section.
cFIncompatibility FaultManualAn 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 FaultManualThe EPM is missing or damaged.Install EPM or replace with new EPM.
F2—F9 FoInternal FaultsManualThe control board has sensed a problemConsult factory.
GFData FaultManualUser 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. See Drive Programming section. 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 FaultAutomaticThe 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 FaultAutomaticLine voltage is too low.Check line voltage — set P01 appropriately.
OFOutput Transistor FaultAutomaticPhase 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 FaultAutomaticVFD 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 FaultAutomaticSingle-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 ClosedAutomaticStart contact is missing or not functioning.Check fan relay.
VFD flashes “---” and LCSStart Contact is Not ClosedAutomaticStart contact not closed.Check FR for closed contact.
VFD flashes 57 (or 47) and LCSSpeed Signal LostAutomaticSpeed 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

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
T049AlertCircuit B Compressor Availability AlertTwo compressors on circuit failedCircuit shut downManual
T051.T052, T053AlertCircuit A Compressor A1 .A2.A3 FailureRespective current sensor board (CSB) feedback signal does not match relay stateRespective compressor shut down in Circuit A.Manual
TOSS, T056, T057AlertCircuit B Compressor B1 .B2.B3 FailureRespective current sensor board (CSB) feedback signal does not match relay stateRespective compressor shut down in Circuit B.Manual
A051, A052, A053AlarmCircuit A Compressor A1 .A2.A3 FailureRespective current sensor board (CSB) feedback signal is ON when the compressor should be offUnit shut downManual
A055, A056, A057AlarmCircuit B Compressor B1 .B2.B3 FailureRespective current sensor board (CSB) feedback signal is ON when the compressor should be offUnit shut downManual
A060AlarmSupply Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)Unit shut downAutomatic
A060AlarmSupply Air Temperature Update not receivedTemperature not updated during 3 minutesUnit shut downAutomatic
A061AlarmReturn Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)Unit shut downAutomatic
A061AlarmReturn Air Temperature Update not receivedTemperature not updated during 3 minutesUnit shut downAutomatic
T068AlertCircuit A Return Gas Thermistor FailureThermistor is outside range of -40 to 245 F (-40 to 118 C)Circuit shut downAutomatic
T069AlertCircuit B Return Gas Thermistor FailureThermistor is outside range of -40 to 245 F (-40 to 118 C)Circuit shut downAutomatic
T073AlertOutside Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)Temperature reset disabled. Unit runs under normal control/set points.Automatic
T074AlertSpace Temperature Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)Temperature reset disabled. Unit runs under normal control/set points.Automatic
T090AlertCircuit A Discharge Pres- sure Transducer FailureThe pressure is outside the range of 0.0 to 667.0 psigCircuit A shut downAutomatic
T091AlertCircuit B Discharge Pres- sure Transducer FailureThe pressure is outside the range of 0.0 to 667.0 psigCircuit B shut downAutomatic
T092AlertCircuit A Suction Pressure Transducer FailureThe pressure is outside the range of 0.0 to 420.0 psigCircuit A shut downAutomatic
T093AlertCircuit B Suction Pressure Transducer FailureThe pressure is outside the range of 0.0 to 420.0 psigCircuit B shut downAutomatic
T094AlertDischarge Gas Thermistor FailureDischarge thermistor (DTT) is either open or shortedDigital compressor shut down.Automatic
T110AlertCircuit 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
T111AlertCircuit B 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
T112AlertCircuit A High Saturated Suction TemperatureCircuit is on and saturated suction temperature is greater than 70 F (15.6 C) for 5 minutesCircuit shut downManual
T113AlertCircuit B High Saturated Suction TemperatureCircuit is on and saturated suction temperature is greater than 70 F (15.6 C) for 5 minutesCircuit shut downManual
T114AlertCircuit 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
T115AlertCircuit 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.Automatic after first daily occurrence, manual thereafter
T118AlertHigh Discharge Gas TemperatureDischarge Thermistor (DTT) reading is greater than 250 FCompressor A1 shutdownAutomatic
A118AlarmHigh Discharge Gas Temperature3 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
T120AlertCircuit 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 shut downAutomatic unless 3rd strike.
A120AlarmCircuit 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 continuously and only one compressor runningCircuit A shut downManual
P121AlertCircuit A Low Saturated SuctionSSTB 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 B will remove one compressor stage.Automatic
T121AlertCircuit B Low Saturated SuctionSSTB 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 continuously and only one compressor runningCircuit B shut downAutomatic unless 3rd strike.
A121AlarmCircuit B Low Saturated SuctionSSTB 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 continuously and only one compressor runningCircuit B shut downManual
T122AlertHigh Pressure Switch Trip Circuit AHigh Pressure A Switch Input open to MBBCircuit shut downManual
T123AlertHigh Pressure Switch Trip Circuit BHigh Pressure B Switch Input open to MBBCircuit shut downManual
T126AlertCircuit A High Discharge PressureSCTA >150 FCircuit shut downAutomatic, only after first 3 daily occurrences.
A126AlarmCircuit A High Discharge PressureSCTA >150 FCircuit shut downManual
T127AlertCircuit B High Discharge PressureSCTB >150 FCircuit shut downAutomatic, only after first 3 daily occurrences
A127AlarmCircuit B High Discharge PressureSCTB >150 FCircuit shut downManual
A140AlarmReverse Rotation DetectedIncoming unit power leads not phased correctlyUnit shut down.Manual
A150AlarmEmergency StopCCN emergency stop command receivedUnit shutdown without going through pump down.Automatic once CCN command for EMSTOP returns to normal
A151AlarmIllegal 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 actionManual
A156AlarmCritical Serial EEPROM Storage FailureConfiguration/storage failure with MBBUnit is not allowed to run.Manual
A157AlarmA/D Hardware FailureHardware failure with peripheral deviceUnit is not allowed to run.Manual
A170AlarmLoss of Communication with CXBMBB loses communication with CXBCXB functions disabledAutomatic
A173AlarmLoss 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.Automatic
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.Automatic
T176Alert4 to 20 mA Temperature Reset Input FailureIf configured with EMM and input less than 2 mA or greater than 22 mAReset function disabled. Unit returns to normal set point control.Automatic
T177Alert4 to 20 mA Demand Limit Input FailureIf configured with EMM and input less than 2 mA or greater than 22 mADemand limit function disabled. Unit returns to 100% demand limit control.Automatic
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 startAutomatic
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 runAutomatic
T202AlertFan Status Switch 2 is open with Dual TSTAT configurationAlert is generated when fan status switch 1 is open when Y3 or Y4 are closedCircuit B is not allowed to runAutomatic
T303AlertCondenser Coil Maintenance DueCoil Service Countdown (C.L.DN) expired. Complete condenser coil cleaning and enter 'YES’ for Coil Maintenance Done (C.L.MN) item.NoneAutomatic
T500AlertCurrent Sensor Board A1 FailureAlert occurs when CSB output is a constant high valueCompressor A1 shut downAutomatic
T501AlertCurrent Sensor Board A2 FailureAlert occurs when CSB output is a constant high valueCompressor A2 shut downAutomatic
T502AlertCurrent Sensor Board A3 FailureAlert occurs when CSB output is a constant high valueCompressor A3 shut downAutomatic
T503AlertCurrent Sensor Board B1 FailureAlert occurs when CSB output is a constant high valueCompressor B1 shut downAutomatic
T504AlertCurrent Sensor Board B2 FailureAlert occurs when CSB output is a constant high valueCompressor B2 shut downAutomatic
T505AlertCurrent Sensor Board B3 FailureAlert occurs when CSB output is a constant high valueCompressor B3 shut downAutomatic