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 actionAutomaticSee the DSC s LEDs for troubleshooting
Compressor A1 Safety TripAdd Strike for Circuit AAutomaticCurrent Sensing turned on (CS.A1 = Enable) and should be off
T051Service Test Compressor A1 Safety TripAdd Strike for Circuit AAutomaticCurrent Sensing turned on (CS.A1 = Enable) and should be off
Compressor A1 Current Detected After TurnoffTurn off all compressorsAutomaticCurrent Sensing turned on (CS.A1 = Enable) and should be off
Service Test Compressor A1 Current Detected After TurnoffTurn off all compressorsAutomaticCurrent Sensing turned on (CS.A1 = Enable) and should be off
T064Circuit A Saturated Condensing Temp Thermistor FailureUse OAT to control Outdoor fansAutomaticFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T066Circuit A Saturated Suction Temperature Thermistor FailureNo CoolingAutomaticSuction transducers internally forced inactive
T073Outdoor Air Temperature Thermistor FailureNo cooling with economizerAutomaticFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T074Space Temperature Thermistor FailureNo heating or coolingAutomaticFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T075Supply Air Temperature Thermistor FailureNo cooling modeAutomaticFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T076Return Air Thermistor FailureNo differential DB crossoverAutomaticFaulty, shorted, or open thermistor caused by wiring error or loose connection.
T077Space Relative Humidity Sensor FailureIf RH.S = Yes. then no indoor humidity controlAutomaticFaulty, 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 PressureShutdown Circuit AAutomaticAn 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 PressureShutdown Circuit AAutomaticAn overcharged system, high outdoor ambient temperature coupled with dirty outdoor coil, plugged filter drier, or a faulty high-pressure switch.
T133Circuit A Low Refrigerant PressureAdd Strike for Circuit AAutomaticLow 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 PressureAdd Strike for Circuit AAutomaticLow 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.
T143Service Test Circuit A Failure To PressurizeAdd Strike for Circuit AAutomaticWiring causing reverse rotation or faulty compressor
T153Real Timedock Hardware FailureNo time and date schedule operationAutomaticNo time/date configured, software failure, or MBB failure
A154Serial EEPROM Hardware FailureUnit ShutdownAutomaticSoftware failure or MBB failure
T155Serial EEPROM Storage Failure ErrorUnit operation errorsAutomaticSoftware failure or MBB failure
A156Critical Serial EEPROM Storage Fail ErrorUnit ShutdownAutomaticSoftware failure or MBB failure
A'D Hardware FailureUnit ShutdownManualSoftware failure or MBB failure
A163Circuit A Down Due to FailureShutdown Circuit AManualCircuit has 3 strikes or has been locked out by another alarm
Service Test Circuit A Down Due to FailureShutdown Circuit AManualCircuit 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 operationAutomaticCommunication wiring problem with ECB or faulty MBB. ECB. orAUXI
T180Loss of communication with the Economizer ActuatorNo economizer operationAutomaticCommunication wiring problem with actuator.
A200Linkage Timeout Error Comm FailureNo Linkage Operation fall back to local SPTAutomaticReceived a table write from Linkage before, now not receiving any linked commands
A404Fire ShutdownUnit ShutdownAutomaticSmoke detected by smoke detector
T408Dirty FilterAlert GeneratedAutomaticDirty 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 Unit ShutdownIf 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 LimitAlert GeneratedAutomaticActuator load too high. Check damper load.
Economizer Damper Actuator Hunting ExcessivelyAlert GeneratedAutomaticDamper position changing too quickly.
Economizer Damper Stuck or JammedAlert GeneratedAutomaticNo economizer motion. Check damper blades, gears, and actuator.
Economizer Damper Actuator Mechanical FailureAlert GeneratedAutomaticCheck actuator and replace if necessary.
Economizer Damper Actuator Direction Switch WrongAlert GeneratedAutomaticActuator direction control switch (CCW, CW) wrong.
T415IAQ Input Out of RangeNo IAQ OperationsAutomaticBad sensor, bad wiring, or sensor configured incorrectly.
T416OAQ Input Out of RangeNo OAQ OperationsAutomaticBad 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. 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

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
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

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