Error code reference
Panasonic Air Conditioner Error Code F90
Power factor correction (PFC) circuit protection
Power factor correction (PFC) circuit protection — PFC circuit abnormal, detected 4 times within 10 minutes.
First step from the service manual
Reset the error code and turn on the unit again; check if AC power supply has normal fluctuation.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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