Troubleshooting SiBE04-10198 Service Diagnosis4.11 Signal Transmission Error (between Indoor and Outdoor Units)Remote ControllerDisplayU4Indoor unit LEDDisplayMethod ofMalfunctionDetectionThe data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked whetherit is normal.MalfunctionDecisionConditionsWhen the data sent from the outdoor unit cannot be received normally, or when the content of the data isabnormal.Supposed Causes Faulty outdoor unit PCB. Faulty indoor unit PCB. Indoor unit-outdoor unit signal transmission error due to wiring error. Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform. Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wiresbetween the indoor and outdoor units (wire No. 2).TroubleshootingCheck No.12Refer to P.121Check the outdoor unit's LED A.Check the indoor unit-outdoor unitconnection wires.YESYESCorrect the indoor unit-outdoorunit connection wires.Diagnose the outdoor unit.Replace the connection wiresbetween the indoor and outdoorunits.Replace the indoor unit PCB (1).Locate the cause of thedisturbance of the power supplywaveform, and correct it.Is there any wiring error?NO(R1058)Is LED A flashing?Is the voltage 0 V?NOCheck No. 12Check power supply waveform.Check the voltage of the indoorunit-outdoor unit connection wiresbetween No. 1 and No. 2, andbetween No 2 and No. 3.YESYESNOIs there any disturbance? NOCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.SiBE04-101.book Page 98 Monday, October 15, 2001 3:08 PM
