Panasonic CS-VZ9SKE Service Manual page 133

17.4.32 F98 (Total Current Protection Control)
Troubleshooting
Check if AC voltage drops during operation.
Check for clogging and interrupted heat radiation on the outdoor unit
heat exchanger.
Measure the current value during rated cooling operation.
Diagnosis Procedures and Cause
No abnormality is observed
No abnormality is observed
Normal
Voltage drops
An abnormality is observed
Higher than the normal value
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Measures to be Taken
Voltage drops for the protection against
supply voltage drop or instantaneous
power interruption.
Fix the problem.
Replace the compressor.
Replace the outdoor unit control board.