Panasonic CS-PS36RKV Service Manual page 52

14.4.13 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)
Malfunction Decision Conditions
Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C)
•
Malfunction Caused
Clogged air filter of the indoor unit
•
Dust accumulation on the indoor unit heat exchanger
•
Air short circuit
•
Detection error due to faulty indoor pipe temperature sensor
•
Detection error due to faulty indoor unit PCB
•
Troubleshooting
52
77