ErrorCodeDoctor
Panasonic · Air Conditioner
Panasonic Air Conditioner F99 error code
Difficulty: Hard
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Cost: $150–$500
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Duration: Requires professional service
The F99 error means your Panasonic air conditioner's outdoor DC peak detection protection has activated — an abnormally high peak in the direct current detected in the outdoor unit's inverter circuit. This is a serious electrical fault that protects the inverter components from damage caused by current spikes. A qualified technician will need to inspect the outdoor unit inverter circuit and power electronics.
Common causes
- DC current spike detected in the outdoor unit inverter circuit
- Power supply abnormality or voltage surge
- Compressor or motor winding fault causing current spikes
- Inverter circuit component has developed a fault
How to fix it
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1
Turn off the unit at the circuit breaker
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2
Contact a qualified technician to inspect the outdoor unit inverter circuit and power electronics