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77

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.
• Compressor malfunction.

78

Malfunction Decision Conditions
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.

79

Malfunction Decision Conditions
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.

80

Malfunction Decision Conditions
During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the compressor
tank temperature sensor.

• Refrigerant shortage (refrigerant leakage).
• 2/3 way valve closed.
• Detection error due to faulty compressor tank temperature sensor.