Panasonic CS-CE9NKE Service Manual page 60

15.4.14 F11 (4-way valve Abnormality)
Malfunction Decision Conditions
When heating operation, when indoor pipe temperature is below 10°C
When cooling operation, when indoor pipe temperature is above 45°C
Malfunction Caused
Connector in poor contact
Faulty sensor
Faulty outdoor unit PCB
4-way valve defective
Troubleshooting
60