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61

• 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.

• 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.

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• During startup, error code appears when different types of indoor and outdoor units are interconnected.

• Wrong models interconnected.
• Wrong indoor unit or outdoor unit PCBs mounted.
• Indoor unit or outdoor unit PCBs defective.
• Indoor-outdoor unit signal transmission error due to wrong wiring.
• Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoor and outdoor

units.

63

• During startup and operation of cooling and heating, the temperatures detected by the indoor intake air temperature sensor are

used to determine sensor errors.

• Faulty connector connection.
• Faulty sensor.
• Faulty  PCB.

64

• During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor temperature sensor

are used to determine sensor errors.

• Faulty connector connection.
• Faulty sensor.
• Faulty PCB.