Panasonic WH-UD07CE5-A Service Manual page 117

17.5.32. 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.
3. Compressor defective (low compression).
Abnormality Judgment:
Continue 3 times in 20 seconds.
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