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F90

F90 — Power factor correction (PFC) circuit protection

Panasonic · Air Conditioner Panasonic PRO Club

What does F90 mean?

The power factor correction circuit has entered protection mode four times within 10 minutes, indicating an abnormality with this circuit, potentially a faulty outdoor PCB.

Common Causes

  • Power factor correction circuit abnormal
  • Outdoor PCB faulty

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the outdoor PCB for visible damage.

  2. 2

    Ensure proper power supply to the unit.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

2 beeps2 beeps - Confirmation of Forced heating operation start3 beeps3 beeps - Remote Control Number Switch Mode standby4 beeps4 beeps - Remote Control Receiving Sound Off/On Mode standby
Source: Air Conditioner Panasonic PRO Club
Open Manual (Page 81)Search more codes in this manual