FAIL POINT B High

Worcester Bosch FAIL POINT B Fault Code

Also written as FAILPOINTB — same fault.

The Worcester Bosch FAIL POINT B fault code means: your boiler has lost power or has a serious internal electronic failure, meaning it cannot start the ignition process to provide heating or hot water.. It appears on 4 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: No green light (Red lights function)

What causes the Worcester Bosch FAIL POINT B fault?

This fault occurs when the boiler's control system loses its vital electrical feed, preventing it from managing the heating process. The most common reason is a blown internal fuse or a failure within the Printed Circuit Board (PCB) which acts as the boiler's brain. In some cases, a faulty transformer is unable to convert power correctly, leading to a total loss of the green operation light.

Typical repair cost £180-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the FAIL POINT B fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch FAIL POINT B fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026