Max Indoor Units Exceeded

What does E43 mean?

The number of indoor units connected to a single outdoor unit exceeds the system's specified design capacity. This will prevent proper communication and operation, potentially leading to system instability.

• Maximum number of indoor units configured exceeds system capacity.
• Incorrect DIP switch settings for indoor unit addressing.
• Control board does not recognize a newly added indoor unit.

Click steps to track your progress.

1. 1

   Count the number of physically connected indoor units and compare this against the outdoor unit's specified maximum capacity.

2. 2

   Verify system design against Mitsubishi Heavy Industries technical documentation for the specific outdoor unit model and configuration.