SiUS04-702 TroubleshootingService Diagnosis 1694.23 Low-voltage DetectionRemoteControllerDisplayU2Method ofMalfunctionDetectionAn abnormal voltage rise or drop is detected by checking the detection circuit or DC voltagedetection circuit.MalfunctionDecisionConditions An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or thevoltage being detected by the DC voltage detection circuit is judged to be below 150 V for 0.1second. The system will be shut down if the error occurs 16 times. Clearing condition: Continuous run for about 60 minutes (normal)SupposedCauses Supply voltage not as specified Over-voltage detector or DC voltage detection circuit defective PAM control part(s) defective Short circuit inside the fan motor winding.TroubleshootingCheck the supply voltage.Correct the power supply.Replace the outdoor unitPCB.Check for such factors for along term.∗ Try to get restarted acouple of times.(R6567)CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.Supply voltage asspecified?NOYESYESTurn on thepower again.System restarted?NORepeat acouple of times.YES(Precaution before turning on the power again)Make sure the power has been off forat least 30 seconds.Rotate fan by hand.Replace fan motor andoutdoor unit PCB .Does fan rotatesmoothly?NODisturbance factors∗ Noise ∗ Power supply distortion
