Panasonic CS-RE9SKUA Service Manual

Also see for CS-RE12SKUA: Installation manual Operating instructions

7417.4 Self-diagnosis Method17.4.1 H11 (Indoor/Outdoor Abnormal Communication)Malfunction Decision Conditions During startup 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 indoor unit PCB. Faulty outdoor unit PCB. Indoor unit-outdoor unit signal transmission error due to wrong wiring. Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between theindoor and outdoor units. Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform.TroubleshootingCheck the indoor-outdoor units’ connection wires.Is there any wiring error?Disconnect terminal 3 wire and measure Vdc between terminal2 & 3 from the outdoor unit.Reconnect terminal 3 wire and measure Vdc between terminal2 & 3 from the outdoor unit.Is the Vdc fluctuate between 10~70Vdc?Is the Vdc fluctuate between 10~70 Vdc?When abnormality indication starts again.For safety reason and to preventcomponent breakdown, always switchoff the power before remove andconnect the component.Replace indoor unit PCB.Replace outdoor PCB.Correct the indoor-outdoor unitsconnection wires.NONONOYESYES