Troubleshooting Flowchart - Panasonic CS-PS9JKT Service Manual

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
Check the indoor-outdoor units' connection wires.
Is there any wiring error?
Disconnect terminal 3 wire and measure Vdc between terminal
2 & 3 from the outdoor unit.
Is the Vdc fluctuate between 20-70Vdc?
Reconnect terminal 3 wire and measure Vdc between terminal
2 & 3 from the outdoor unit.
Is the Vdc fluctuate between 20-50Vdc?
NO
YES
44
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
YES
•
Correct the indoor-outdoor units
connection wires
NO
•
Replace outdoor PCB
NO
•
Replace indoor unit PCB.