Fault 01 Code 201 — BUS communication fault, incorrect device connected

What does Fault 01 201 mean?

The Worcester Bosch Greenstar CDi Boiler displays Fault 01 with code 201, indicating that an incorrect BUS subscriber device has been connected to the system, causing communication issues.

• An incompatible or incorrect BUS device is connected
• Misconfiguration of the BUS system

Click steps to track your progress.

1. 1

   Review your system's installation diagram to identify the correct BUS devices.

2. 2

   Inspect connected devices to ensure they match the required specifications.

3. 3

   If an incorrect device is found, identify it and replace it with the correct one, or contact a qualified heating engineer for assistance.