Panasonic CS-XE9PKUA - Manual (Page 71)

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15.4.17 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
š Freeze prevention control takes place (when indoor pipe temperature is lower than 35.6°F (2°C))
Malfunction Caused
š Air short circuit at indoor unit
š Clogged indoor unit air filter
š Dust accumulation on the indoor unit heat exchanger
š 2/3 way valve closed
š Faulty indoor unit fan motor
š Refrigerant shortage (refrigerant leakage)
š Clogged expansion valve or strainer
š Faulty indoor pipe temperature sensor
š Faulty indoor unit PCB
Troubleshooting