Multiple Connectors Open

What does F9 mean?

Two or more connectors on the outdoor unit are detected as open or disconnected. This indicates a widespread connection issue or a potential fault on the outdoor unit's main PCB, affecting multiple circuits.

1. 1

   Visually inspect all accessible connectors on the outdoor unit PCB — verify they are securely seated and undamaged.

2. 2

   Check for any visible damage on the outdoor unit PCB itself, such as burn marks or corrosion.