Troubleshooting SiBE07-618_C92 Service Diagnosis4.24 Low-voltage Detection or Over-voltage DetectionRemoteControllerDisplayU2Method ofMalfunctionDetectionLow-voltage detection:An abnormal voltage drop is detected by the DC voltage detection circuit.Over-voltage detection:An abnormal voltage rise is detected by the over-voltage detection circuit.MalfunctionDecisionConditionsLow-voltage detection: The voltage detected by the DC voltage detection circuit is below 150 V. If the error repeats 16 times, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other errorOver-voltage detection: An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer. The compressor stops if the error occurs, and restarts automatically after 3-minute standby.SupposedCauses Supply voltage is not as specified. Defective DC voltage detection circuit Defective over-voltage detection circuit Defective PAM control part Layer short inside the fan motor windingTroubleshootingCorrect the power supply.Replace the PM1.(Replace the outdoor unitPCB.)Check for such factors for along term.∗ Try to restart a few times.(R11138)CautionNOYESYESNOYES(Precaution before turning on the power again)NO Replace the fan motor orthe outdoor unit PCB.Check the supply voltage.Rotate the fan by hand.Disturbance factors∗ Noise ∗ Power supply distortionRepeat a fewtimes.Make sure the power has been off forat least 30 seconds.Be sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.Turn on thepower again. Systemrestarted?Does the fan rotatesmoothly?Supply voltage asspecified?
