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49

• 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.

50

• 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.

51

• 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.

52

• A current transformer (CT) is detected by checking the compressor running frequency (  rated frequency) and CT detected input

current (less than 0.65A) for continuously 20 seconds.

• CT defective.
• Outdoor PCB defective.
• Compressor defective (low compression).