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15.5. Self-diagnosis Method
15.5.1. 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
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