6603 - Transmission bus BUSY error (M-NET Remote controller only)

What does 6603 mean?

The transmission bus for the M-NET Remote controller is detected as continuously busy, preventing proper communication and causing the air conditioning system to automatically stop.

• Interference or noise on the communication line.
• Too many devices attempting to communicate on the M-NET bus simultaneously.
• A faulty M-NET device causing constant bus activity.

Click steps to track your progress.

1. 1

   Note the 6603 code displayed on your remote controller.

2. 2

   Turn off the main power supply to the system at the circuit breaker.

3. 3

   Wait for 1 minute, then turn the main power supply back on.

4. 4

   If the error persists, contact a qualified service technician to check the M-NET communication line and connected devices for issues.