17.4.18
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
128