SiUS181631EA Troubleshooting for Outdoor UnitTroubleshooting 2497.21 Compressor Start-up ErrorError Code L9Method of ErrorDetectionThe error is detected from current flowing in the power transistor.Error DecisionConditionsStarting control of the compressor does not complete.SupposedCauses Defective compressor Large pressure difference before starting the compressor Defective main PCB (A1P)TroubleshootingDisconnect the connectionbetween the compressor andthe main PCB. Turn thepower transistor check modesetting ON in setting mode 2.Thedifferencebetween high andlow pressure when startingis above 0.2 MPa(67 ftAq).Afterturning on again, L9blinks again.Is theinverteroutput voltagebalanced? (Normal ifwithin ±5 V. Must bemeasured whenfrequency isstable.)Replace the main PCB(A1P).NOUnsatisfactory pressureequalization.Check refrigerant system.NOYESYESInspect the compressoraccording to the diagnosisprocedure for odd noises,vibration and operatingstatus of the compressor.(R22103)Reset and restart.NOYESCautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.
