How much does it cost to fix boiler error code Section B?

Typical repair cost for the boiler Section B fault is £150-300 including labour.

Section B High

Boiler Fault Code Section B

Also written as SECTIONB — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Section B appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to circulate water because the pump responsible for moving it around your system is not receiving the correct power, causing your heating and hot water to stop working. (As reported on Alpha 240XE)

Pick your boiler brand for the Section B fix

Alpha Section B 1 model Baxi Section B 2 models

Source

Information for the Section B fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

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