SiBE061121 TroubleshootingService Diagnosis 1204.27 Signal Transmission Error on Outdoor Unit PCB(50 Class Only)RemoteControllerDisplayU7Method ofMalfunctionDetectionCommunication error between microcomputer mounted on the main microcomputer and PM1.MalfunctionDecisionConditions The abnormality is determined when the data sent from the PM1 can not be received for 9seconds. The error counter is reset when the data from the PM1 can be successfully received.SupposedCauses Defective outdoor unit PCBTroubleshooting(R7185)CautionNOYESTurn off the power and turn it onagain.Error again? Replace the outdoor unitPCB.The cause can be anexternal factor other thanthe malfunction.Observe the operatingcondition in long term.Be sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.
