Si12-308 TroubleshootingService Diagnosis 2055.24 Low-voltage DetectionRemoteControllerDisplayU2Outdoor Unit LEDDisplayA 5 1 4 2 1 3 1 4 4Method 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, orthe voltage being detected by the DC voltage detection circuit is judged to be below 150 Vfor 0.1 second. 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) defectiveTroubleshootingCheck the supply voltage.Correct the power supply.Check for such factors for along term.∗ Try to get restarted acouple of times.Replace the SPM.(Replace the outdoor unitPCB.)(R2854)CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.Supply voltage asspecified?NOYESTurn 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.Disturbance factors∗ Noise ∗ Power supply distortion
