FA - L2-phased open phase or 51CM connector open in outdoor unit

What does FA mean?

This code indicates an open phase on the L2 line of the power supply or a disconnection of the 51CM connector in the outdoor unit.

• Loose or disconnected L2 wiring.
• Problem with the 51CM connector.
• Faulty circuit related to L2 phase or 51CM.

Click steps to track your progress.

1. 1

   Switch off the power to the entire AC system at the breaker.

2. 2

   Inspect the circuit breaker for the outdoor unit and reset if tripped.

3. 3

   A qualified technician should check the L2 phase wiring and the 51CM connector in the outdoor unit for proper connection.

4. 4

   Restore power once the issue is addressed.