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15.4.18 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
Troubleshooting
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