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78
15.4.20. 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 at indoor unit
• Clogged indoor unit air filter
• Dust accumulation on the indoor unit heat exchanger
• 2/3 way valve closed
• Faulty indoor unit fan motor
• Refrigerant shortage (refrigerant leakage)
• Clogged expansion valve or strainer
• Faulty indoor pipe temperature sensor
• Faulty indoor unit PCB
• Clogged indoor unit air filter
• Dust accumulation on the indoor unit heat exchanger
• 2/3 way valve closed
• Faulty indoor unit fan motor
• Refrigerant shortage (refrigerant leakage)
• Clogged expansion valve or strainer
• Faulty indoor pipe temperature sensor
• Faulty indoor unit PCB
Troubleshooting
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