SiEBE18-526 Troubleshooting for Outdoor UnitTroubleshooting 2977.4 Compressor Motor LockRemoteControllerDisplayE5ApplicableModelsAII outdoor unit modelsMethod ofMalfunctionDetectionInverter PC board takes the position signal from UVWN line connected between the inverter andcompressor, and detects the position signal pattern.MalfunctionDecisionConditionsThe position signal with 3 times cycle as imposed frequency is detected when compressormotor operates normally, but 2 times cycle when compressor motor locks. When the positionsignal in 2 times cycle is detected.SupposedCauses Compressor lock High differential pressure (0.5MPa or more) Incorrect UVWN wiring Faulty inverter PCB Stop valve is left in closed.TroubleshootingCheck the installationconditions.Is the stop valve open? NOIs the UVWN wiringnormal?NONONONOIs highdifferential pressurestarting? (0.5MPaor more)YESYESYESCheck and seewhether compressor isshort-circuited orground.YESYESAre inverteroutput voltages the samefor 3 phases?Does low orhigh pressure varyeven instantaneously whenrestartingcompressor?YESCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.Open the stop valve.Connect correctly.Remedy the cause.Replace the compressor.Replace the inverter PCB(A2P).Replace the compressor.(Q0425)NO
