Panasonic CS-E18QB4RW Service Manual page 64

15.4.5 H16 (Outdoor Current Transformer)
Malfunction Decision Conditions

An input current, detected by Current Transformer CT, is below threshold value when the compressor is
operating at certain frequency value for 3 minutes.
Malfunction Caused

Lack of gas

Broken CT (current transformer)

Broken Outdoor PCB
Troubleshooting
64