B1 — Code plug not detected

What does B1 mean?

The boiler's code plug has not been detected. The code plug is essential for the boiler's correct operation as it identifies the boiler type and settings.

• Code plug is missing.
• Code plug is incorrectly inserted.
• Code plug is defective or damaged.

Click steps to track your progress.

1. 1

   Power cycle the boiler by turning it off at the mains for 30 seconds, then turn it back on.

2. 2

   Locate the code plug (refer to your boiler manual for its position) and ensure it is fully and correctly inserted.

3. 3

   If the code plug is confirmed to be installed correctly and the error persists, contact a Gas Safe registered engineer for further assistance.