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Mitsubishi Air Conditioner Error Codes

80 error codes for Mitsubishi air conditioner models. Each links to the full diagnostic procedure from the service manual.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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E.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 faultE.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 (overcurrent) warningPSPU stopRBRegenerative brake pre-alarmSASafety stopSLSpeed limit indicationTHElectronic thermal relay function pre-alarmUFUSB host error

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