Categories: Air Conditioner

Carrier air conditioner error codes

The function of failures determination is stored in the Carrier air conditioner program. The system is able to correct some violations itself, but it does not help at all times. Therefore, it is desirable to have a manual containing error codes decoding at hand. It is presented below in form of a table.

Carrier GEMINI 38APD025-100 air conditioner error codes

Air conditioners from the Carrier GEMINI 38APD025-100 range belong to commercial lineup, and therefore, are excellent for restaurants, hotels, government buildings etc. 38AP air-cooled condensing unit boasts Comfortlink™ electronic system controls. The system composed of several elements is responsible for controlling and monitoring all operations of the unit.

ALARM/ ALERT CODEDESCRIPTIONWHY WAS THIS ALARM GENERATED?
T048Circuit A Compressor Availability AlertTwo compressors on circuit failed
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 state
TOSS, T056, T057Circuit B Compressor B1 .B2.B3 FailureRespective current sensor board (CSB) feedback signal does not match relay state
A051, A052, A053Circuit A Compressor A1 .A2.A3 FailureRespective current sensor board (CSB) feedback signal is ON when the compressor should be off
A055, A056, A057Circuit B Compressor B1 .B2.B3 FailureRespective current sensor board (CSB) feedback signal is ON when the compressor should be off
A060Supply Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)
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
T068Circuit A Return Gas Thermistor FailureThermistor is outside range of -40 to 245 F (-40 to 118 C)
T069Circuit B Return Gas Thermistor FailureThermistor is outside range of -40 to 245 F (-40 to 118 C)
T073Outside Air Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)
T074Space Temperature Thermistor FailureThermistor outside range of -40 to 245 F (-40 to 118 C)
T090Circuit A Discharge Pres- sure Transducer FailureThe pressure is outside the range of 0.0 to 667.0 psig
T091Circuit B Discharge Pres- sure Transducer FailureThe pressure is outside the range of 0.0 to 667.0 psig
T092Circuit A Suction Pressure Transducer FailureThe pressure is outside the range of 0.0 to 420.0 psig
T093Circuit B Suction Pressure Transducer FailureThe pressure is outside the range of 0.0 to 420.0 psig
T094Discharge Gas Thermistor FailureDischarge thermistor (DTT) is either open or shorted
T110Circuit A Loss of ChargeIf the compressors are off and discharge pressure reading is less than 26 psig for 30 sec.
T111Circuit B Loss of ChargeIf the compressors are off and discharge pressure reading is less than 26 psig for 30 sec.
T112Circuit A High Saturated Suction TemperatureCircuit is on and saturated suction temperature is greater than 70 F (15.6 C) for 5 minutes
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.
T115Circuit B Low Suction SuperheatSuction superheat is less than 5 F (2.8 C) for 5 minutes.
T118High Discharge Gas TemperatureDischarge Thermistor (DTT) reading is greater than 250 F
A118High Discharge Gas Temperature3 Discharge Gas Temperature alarms occur within a day
P120Circuit 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
T120Circuit 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
A120Circuit 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 running
P121Circuit 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 continuously
T121Circuit 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 running
A121Circuit 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 running
T122High Pressure Switch Trip Circuit AHigh Pressure A Switch Input open to MBB
T123High Pressure Switch Trip Circuit BHigh Pressure B Switch Input open to MBB
T126Circuit A High Discharge PressureSCTA >150 F
A126Circuit A High Discharge PressureSCTA >150 F
T127Circuit B High Discharge PressureSCTB >150 F
A127Circuit B High Discharge PressureSCTB >150 F
A140Reverse Rotation DetectedIncoming unit power leads not phased correctly
A150Emergency StopCCN emergency stop command received
A151Illegal ConfigurationOne or more illegal configurations exists.
T153Real Time Clock Hardware FailureInternal clock on MBB fails
A154Serial EEPROM Hardware FailureHardware failure with MBB
T155Serial EEPROM Storage FailureConfiguration/storage failure with MBB
A156Critical Serial EEPROM Storage FailureConfiguration/storage failure with MBB
A157A/D Hardware FailureHardware failure with peripheral device
A170Loss of Communication with CXBMBB loses communication with CXB
A173Loss of Communication with EMMMBB loses communication with EMM
T1744 to 20 mA Cooling Set Point/Desired % Capacity Input FailureIf configured with EMM and input less than 2 mA or greater than 22 mA
T1764 to 20 mA Temperature Reset Input FailureIf configured with EMM and input less than 2 mA or greater than 22 mA
T1774 to 20 mA Demand Limit Input FailureIf configured with EMM and input less than 2 mA or greater than 22 mA
A200Fan Status Switch 1 OpenAlarm is generated when fan status switch 1 is open when the unit is in an ON state
T201Fan Status Switch 1 is open with Dual TSTAT configurationAlert is generated when fan status switch 1 is open when Y1 or Y2 are closed
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.
T500Current Sensor Board A1 FailureAlert occurs when CSB output is a constant high value
T501Current Sensor Board A2 FailureAlert occurs when CSB output is a constant high value
T502Current Sensor Board A3 FailureAlert occurs when CSB output is a constant high value
T503Current Sensor Board B1 FailureAlert occurs when CSB output is a constant high value
T504Current Sensor Board B2 FailureAlert occurs when CSB output is a constant high value
T505Current Sensor Board B3 FailureAlert occurs when CSB output is a constant high value

Carrier MOTORMASTER 4850P3 air conditioner error codes

Carrier MOTORMASTER 4850P3 is a motor speed control device for 48/50P030-100 units. It makes the operating range of air conditioners wider and allows you to use your air conditioner at lower outdoor ambient temperatures. Should the device break down, you may try fixing it on your own using the error codes from the tables below.

CODEDESCRIPTIONPROBABLE CAUSE
AFHigh Temperature FaultAmbient temperature is too high; Cooling fan has failed (if equipped).
CFControl FaultA blank EPM, or an EPM with corrupted data has been installed.
cFIncompatibility FaultAn EPM with an incompatible parameter version has been installed.
F1EPM FaultThe EPM is missing or damaged.
F2—F9 FoInternal FaultsThe control board has sensed a problem
GFData FaultUser data and Carrier defaults in the EPM are corrupted.
HFHigh DC Bus Voltage FaultLine voltage is too high; Deceleration rate is too fast; Overhauling load.
JFSerial FaultThe watchdog timer has timed out, indicating that the serial link has been lost.
LFLow DC Bus Voltage FaultLine voltage is too low.
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.
PFCurrent Overload FaultVFD is undersized for the application; Mechanical problem with the driven equipment.
SFSingle-phase FaultSingle-phase input power has been applied to a three-phase drive.
Drive displays “—“ even though drive should be runningStart Contact is Not ClosedStart contact is missing or not functioning.
VFD flashes “---” and LCSStart Contact is Not ClosedStart contact not closed.
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).