F46 — Outdoor Current Transformer open circuit

What does F46 mean?

The outdoor current transformer (CT) circuit is detected as open, indicating an issue with current measurement.

• Insufficient refrigerant.
• Defective outdoor PCB (Printed Circuit Board).
• Compressor low (possible low current or internal fault).

Click steps to track your progress.

1. 1

   Turn off the power supply to the unit at the main breaker and wait at least 5 minutes before restoring power.

2. 2

   Visually inspect the outdoor unit's wiring, especially around the current transformer, for any loose or broken connections.

3. 3

   If the error persists, contact a qualified technician to check refrigerant levels and the outdoor PCB.