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Model reference

Mitsubishi T/YZC072FW

Air Conditioner

1 document80 error codes7 service modes

Available documentation

Service Manual

  • Troubleshooting Guide - Packaged Rooftop Air Conditioners Precedent eFlex Variable Speed Compressor Inverter152 pg
    Covers this model
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Error codes (80)

CodeMeaning
CPParameter copy warningE.1Option faultE.11Internal circuit faultE.13Internal circuit faultE.16User definition error by PLC functionE.17User definition error by PLC functionE.18User definition error by PLC functionE.19User definition error by PLC functionE.2Option faultE.20User definition error by PLC functionE.3Option faultE.5CPU fault variant (Fault 5).E.6CPU fault variant (Fault 6).E.7CPU fault variant (Fault 7).E.AIEAnalog input faultE.BEBrake transistor alarm detectionE.CDOAbnormal output current detectionE.CPUCPU faultE.CTEOperation panel power supply short circuit / RS-485 terminals power supply…E.ECTSignal loss detectionE.EPEncoder phase faultE.FINHeatsink overheatE.GFOutput side earth (ground) fault overcurrentE.IAHAbnormal internal temperature (IP55 compatible models only)E.ILFInput phase lossE.IOHInrush current limit circuit faultE.IPFInstantaneous power failureE.LCI4 mA input faultE.LFOutput phase lossE.MB1Brake sequence fault
View all 80 error codes
E.MPMagnetic pole position unknownE.OC1Overcurrent trip during accelerationE.OC2Overcurrent trip during constant speedE.OC3Overcurrent trip during deceleration or stopE.ODExcessive position faultE.OHTExternal thermal relay operationE.OLTStall prevention stopE.OP1Communication option faultE.OPTOption faultE.OSOverspeed occurrenceE.OSDSpeed deviation excess detectionE.OV1Regenerative overvoltage trip during accelerationE.OV2Regenerative overvoltage trip during constant speedE.OV3Regenerative overvoltage trip during deceleration or stopE.P2424 VDC power faultE.PBTInternal circuit fault related to pre-charge/brake transistor.E.PCHPre-charge faultE.PEParameter storage device fault (control circuit board)E.PE2Parameter storage device fault (main circuit board)E.PIDPID signal faultE.PTCPTC thermistor operationE.PUEPU disconnectionE.RETRetry count excessE.SAFSafety circuit faultE.SERCommunication fault (inverter)E.SOTLoss of synchronism detectionE.THMMotor overload tripE.THTInverter overload tripE.USBUSB communication faultE.UVTUndervoltageEr1Parameter write errorEr2Write error during operationEr3Calibration errorEr4Mode designation errorEr8USB memory device operation errorEV24V external power supply operationFNFan alarmFN2Internal fan alarm (IP55 compatible models only)HOLDOperation panel lockLOCdPassword lockedMT1Maintenance signal output 1MT2Maintenance signal output 2MT3Maintenance signal output 3oLStall prevention (overvoltage) warningPSPU stopRBRegenerative brake pre-alarmSASafety stopSLSpeed limit indicationTHElectronic thermal relay function pre-alarmUFUSB host error

Service modes (7)

  • Easy Setting ModePress PU/EXT and MODE simultaneously for 0.5 seconds.
  • Faults History Check1
  • Initial Value Change List1
  • Parameter Setting Mode1
  • PU Operation ModePress PU/EXT button on operation panel
  • Trace ModeSet Pr.1020 Trace operation selection
  • USB Memory Mode1

Full entry steps, exit procedures, and test sequences are available in Max.

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