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77

• During cooling, compressor frequency = Fcmax.
• During heating, compressor frequency > Fhrated.
• During cooling and heating operation, running current: 0.65A < I < 1.65A.
• During cooling, indoor intake - indoor pipe < 4

°C.

• During heating, indoor pipe - indoor intake < 5

°C.

Multi Models Only

- Gas shortage detection 1: A gas shortage is detected by checking the CT-detected input current value and the compressor

running frequency. During startup and operating of cooling and heating, input current < 8.78/256 (A/Hz) 

× compressor

running frequency + 0.25.

- Gas shortage detection 2: A gas shortage is detected by checking the difference between indoor pipe temperature and indoor

intake air temperature during cooling and heating.

• Refrigerant shortage (refrigerant leakage).
• Poor compression performance of compressor.
• 2/3 way valve closed.
• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.

78

A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit.

• Compressor terminal disconnect.
• Outdoor PCB malfunction.
• Compressor malfunction.

79

During operation of cooling, when outdoor unit heat exchanger high temperature data (61

°C) is detected by the outdoor pipe

temperature sensor.

• Air short circuit at outdoor unit.
• Dust accumulation on the outdoor unit heat exchanger.
• 2/3 way valve closed.
• Faulty outdoor unit fan motor.
• Excessive refrigerant.
• Clogged expansion valve or strainer.
• Faulty outdoor pipe temperature sensor.
• Faulty outdoor unit PCB.

80

During operating of cooling and heating, when IPM temperature data (100

°C) is detected by the IPM temperature sensor.

Multi Models Only

• Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated.
• Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90°C) is detected by the heat

sink temperature sensor.

• IPM overheats due to short circuit of hot discharge air flow.
• IPM overheats due to defective of outdoor fan motor.
• IPM overheats due to defective of internal circuitry of IPM.
• IPM overheats due to defective IPM temperature sensor.

Multi Models Only

• Compressor OL connector poor contact.
• Compressor OL faulty.