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77

• Freeze prevention control takes place (when indoor pipe temperature is lower than 2

qC).

• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• Air short circuit.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.

78

• When heating operation, when indoor pipe temperature is below 10

qC.

• When cooling operation, when indoor pipe temperature is above 45

qC.

• Connector in poor contact.
• Faulty sensor.
• Faulty outdoor unit PCB.
• 4-way valve defective.

79

• When the different between indoor intake air temperature and indoor pipe temperature is above 10

qC or indoor pipe temperature

is below -1.0

qC.

Remark:
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor unit and H39 to
other indoor unit(s).

• Wrong wiring connection.
• Faulty sensor.
• Faulty expansion valve.

80

• During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit

main PCB senses abnormal high DC voltage level.

• DC voltage peak due to power supply surge.
• DC voltage peak due to compressor windings not uniform.
• Faulty outdoor PCB.