FA — Incompatible unit combination

What does FA mean?

This error indicates that the combination of connected indoor and outdoor units is not compatible according to the system's design specifications. This prevents the system from operating as a unified air conditioning system.

• Attempting to connect indoor units not listed as compatible with the outdoor unit model.
• Incorrect model pairing for the installed system.
• Installation errors leading to an unsupported configuration.

Click steps to track your progress.

1. 1

   Refer to the official Mitsubishi Electric compatibility charts or the outdoor unit's product manual for compatible indoor unit models.

2. 2

   Verify that all connected indoor unit models are explicitly listed as compatible with your specific outdoor unit.

3. 3

   If units are confirmed incompatible, they must be replaced with models that are compatible with your outdoor unit.

4. 4

   Power cycle the system after making any changes to unit combinations.

5. 5

   If you are unsure about compatibility, contact your installer or a Mitsubishi Electric dealer.