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

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

Section B High

Alpha Section B Fault Code

Q: What does the Alpha Section B fault code mean?

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.

Also written as SECTIONB — same fault.

The Alpha Section B fault code means: 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.. It appears on 1 Alpha model in our database.

Technical description: 240 V at Pump or PCB terminals 20, 21

Typical repair cost £150-300 (including labour)

Engineer required

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

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Alpha models that show the Section B fault code

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

240XE Repair: £150-300

Source

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

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