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85

• 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

qC.

• During heating, indoor pipe - indoor intake < 5

qC.

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) 

u 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.

86

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

• Compressor terminal disconnect.
• Outdoor PCB malfunction.

87

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

qC) is detected by the outdoor pipe

temperature sensor.

• Outdoor pipe temperature rise due to short circuit of hot discharge air flow.
• Outdoor pipe temperature rise due to defective of outdoor fan motor.
• Outdoor pipe temperature rise due to defective outdoor pipe temperature sensor.
• Outdoor pipe temperature rise due to defective outdoor unit PCB.

88

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

qC) 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.