EC — Total capacity error

What does EC mean?

This error indicates a mismatch in the total cooling or heating capacity of the connected indoor units compared to the outdoor unit's capacity. This mismatch prevents the system from operating correctly.

• Incorrect capacity settings configured for indoor or outdoor units.
• Miscalculation of total capacity during installation.
• Incompatible unit combination (indoor units exceed outdoor unit's capacity).
• Incorrect DIP switch settings on the outdoor unit.

Click steps to track your progress.

1. 1

   Refer to the outdoor unit's installation manual to confirm the specified range for the total capacity of connected indoor units.

2. 2

   Verify that the summed capacity of all connected indoor units falls within this allowed range.

3. 3

   Ensure any capacity setting dip switches or software configurations on the outdoor unit are correctly set.

4. 4

   Power cycle the outdoor unit by turning off its main breaker for a few minutes, then restart.

5. 5

   If the capacity settings are confirmed correct and within range, a technician should re-evaluate the system design.