Panasonic CU-3E19RBU-5 Service Manual

Also see for CU-3E19RBU-5: Operating instructions

Panasonic CU-3E19RBU-5 Service Manual Manual pdf 65 page image

6515.2 Self-diagnosis Method15.2.1 H11 (Indoor/Outdoor Abnormal Communication)Malfunction Decision Conditions During standby and operation of cooling and heating, the data received from outdoor unit in indoor unit signaltransmission is checked whether it is normal.Malfunction Caused Faulty outdoor unit PCB. Faulty indoor unit PCB. Indoor-outdoor signal transmission error due to wrong wiring. Indoor-outdoor signal transmission error due to breaking of wire in the connection wires between the indoor andoutdoor units. Indoor-outdoor signal transmission error due to disturbed power supply waveform.Abnormality Judgment: After operation for 1 minute.TroubleshootingCheck the indoor-outdoorunits connection wires.Correct the indoor-outdoorunits connection wires.Is there any wiring error?Disconnect terminal 3wire and measure Vdcbetween terminal 2 & 3from the outdoor unit.Is the Vdc fluctuatebetween 10-70Vdc?Reconnect terminal 3wire and measure Vdcbetween terminal 2 & 3from the outdoor unit.Is the Vdc fluctuatebetween 10-70Vdc?Replace outdoor unitPCB.YesReplace indoor unit PCB.For safety reason and to prevent componentbreakdown, always switch off the power beforeremove and connect the component.YesNoNoNoYesCaution