SiUS181631EA Troubleshooting for Outdoor UnitTroubleshooting 2477.19 Inverter Compressor AbnormalityError Code L5Method of ErrorDetectionThe error is detected from current flowing in the power transistor.Error DecisionConditionsWhen an excessive current flows in the power transistor(Instantaneous overcurrent also causes activation.)SupposedCauses Defective compressor coil (disconnected, defective insulation) Compressor start-up malfunction (mechanical lock) Defective main PCB (A1P)TroubleshootingNote: Higher voltage than actual is displayed when the inverter output voltage is checked by multimeter.Disconnect the connectionbetween the compressorand the main PCB. Turn thepower transistor checkmode setting ON in settingmode 2.Is thecompressor's coildisconnected or theinsulation isdefective?There isinstantaneous powerfailure.Is the inverteroutput voltagebalanced? (Normal ifwithin ±5V. Must bemeasured whenfrequency isstable.)Inspect the compressoraccording to the diagnosisprocedure for odd noises,vibration and operatingstatus of the compressor.(R22101)Replace the compressor.YESCorrect power supply.NOReplace the main PCB(A1P).NONOYESYESCautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.
