49C Connector Open

What does F4 mean?

The 49C connector on the outdoor unit's PCB is detected as open or disconnected. This indicates a break in a circuit, likely related to a current transformer or a thermal protector within the outdoor unit.

• Open circuit detected at the 49C connector.
• Wiring issue or disconnection at the 49C thermistor.
• Faulty 49C temperature sensor.

Click steps to track your progress.

1. 1

   Inspect the 49C 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 49C connector using a multimeter.