Fault BD — Communication error, Vitotrol remote control for heating circuit 2

What does BD mean?

The boiler is in control mode but detects a communication error with the Vitotrol remote control unit for heating circuit 2 (which has a mixing valve). This means the remote control cannot properly communicate with the boiler.

• Loose or damaged connections to the remote control
• Damaged communication cable
• Incorrect setting of coding address 'A0' in the 'Heating circuit' group
• Faulty remote control unit

Click steps to track your progress.

1. 1

   Check all physical connections and the cable for the Vitotrol remote control for heating circuit 2.

2. 2

   Verify the setting of coding address 'A0' in the 'Heating circuit' group on the boiler control.

3. 3

   Ensure the remote control unit settings are correct.

4. 4

   If the issue persists, the remote control unit may need to be checked or replaced by a professional.