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15.5.15. H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)
Error code will not display (no TIMER LED blinking) but store in EEPROM
Malfunction Decision Conditions
• Freeze prevention control takes place (when indoor pipe temperature is lower than 2
°C).
Malfunction Caused
• Air short circuit.
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• 2/3 way valve closed.
• Faulty indoor fan motor.
• Refrigerant shortage (refrigerant leakage).
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• 2/3 way valve closed.
• Faulty indoor fan motor.
• Refrigerant shortage (refrigerant leakage).
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
Troubleshooting
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