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17.4.26 F90 (PFC Protection)
Troubleshooting
Diagnosis Procedures and Cause
Measures to be Taken
PFC protection is activated at every operation
PFC protection
is activated
occasionally
Is PFC protection activated occasionally, or is F90 stored in the memory only?
Replace the outdoor unit control board.
PFC protection is activated as a
protection against supply voltage drop
or instantaneous power interruption.
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