Panasonic WH-MDC09C3E5 Servise Manual page 112

16.5.32. Outdoor Current Transformer Open Circuit (F46)
Malfunction Decision Conditions:
A current transformer (CT) open circuit is detected by checking the compressor running frequency ( rated frequency) and CT
detected input current (< 0.65A) for continuously 20 seconds.
Malfunction Caused:
1. CT defective.
2. Faulty outdoor unit PCB (main).
3. Compressor defective (low compression).
Abnormality Judgment:
Continue 3 times in 20 minutes.
112