Panasonic CS-PS9JKT

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14.4 Troubleshooting Flowchart
14.4.1 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 signal
transmission 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 the
indoor and outdoor units.
• Indoor unit-outdoor unit signal transmission error due to disturbed power supply waveform.
Troubleshooting
When abnormality indication starts again
Is there any wiring error?
• Correct the indoor-outdoor units
connection wires
Check the indoor-outdoor units’ connection wires.
Disconnect terminal 3 wire and measure Vdc between terminal
2 & 3 from the outdoor unit.
Is the Vdc fluctuate between 20-70Vdc?
•
Replace outdoor PCB
Reconnect terminal 3 wire and measure Vdc between terminal
2 & 3 from the outdoor unit.
Is the Vdc fluctuate between 20-50Vdc?
•
Replace indoor unit PCB.
NO
YES
NO
NO
YES
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.