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16.4 Troubleshooting Flowchart
16.4.1 H11 (Indoor/Outdoor Abnormal Communication)
Malfunction Decision Conditions
During startup and operation of cooling, 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
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.
Reconnect terminal 3 wire and measure Vdc between terminal
2 & 3 from the outdoor unit.
Is the Vdc fluctuate between 20-50 Vdc?
Is the Vdc fluctuate between 20-70 Vdc?
When abnormality indication starts again.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Replace indoor unit PCB.
Replace outdoor PCB.
Correct the indoor-outdoor units
connection wires.
NO
NO
NO
YES
YES
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