63L Connector Open

What does F3 mean?

The 63L connector on the outdoor unit's printed circuit board (PCB) is detected as open or disconnected. This typically relates to a specific protective device or sensor circuit experiencing a loss of connection.

1. 1

   Inspect the 63L connector on the outdoor unit PCB — verify it is securely seated and free from corrosion.

2. 2

   Check the continuity of the wiring connected to the 63L connector using a multimeter.