Error 203 — Communication error between main and sub outdoor units

What does 203 mean?

This error occurs when there is a communication problem between the main outdoor unit and a sub-outdoor unit in a multi-system setup.

• Communication cable issue between outdoor units
• Faulty connection on one of the outdoor units
• Configuration error in multi-unit setup

Click steps to track your progress.

1. 1

   Inspect the communication cable connecting the main and sub outdoor units.

2. 2

   Verify connections at both outdoor units.

3. 3

   Ensure the outdoor units are correctly configured for multi-unit operation.

4. 4

   Contact support if the issue persists after checking connections.