E43 - Maximum number of indoor units connected exceeded

What does E43 mean?

This error indicates that the number of indoor units connected to a single outdoor unit has exceeded the system's maximum allowable limit.

• Incorrect system design or installation with too many indoor units.
• Accidental connection of additional indoor units.
• Misconfiguration of the system.

Click steps to track your progress.

1. 1

   Turn off the main power to the entire AC system at the circuit breaker.

2. 2

   Consult your system's installation manual to determine the maximum number of indoor units supported by your outdoor unit model.

3. 3

   If more units are connected than allowed, one or more units must be disconnected by a qualified technician.

4. 4

   Restore power once the system configuration matches the specifications.