U7 - Malfunction of transmission between outdoor units or outdoor storage unit (Outdoor Unit)

What does U7 mean?

This error indicates a communication failure between multiple outdoor units or between an outdoor unit and a storage unit.

• Wiring problem between outdoor units
• Faulty outdoor unit or storage unit
• Incorrect addressing

Click steps to track your progress.

1. 1

   Turn off power to all connected outdoor and storage units.

2. 2

   Check the communication wiring between these units.

3. 3

   Verify correct addressing for each unit.

4. 4

   Restore power and check for communication.

5. 5

   If the error persists, contact a service technician.