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

Typical repair cost for the Baxi Section B fault is £180-£450 including labour.

Section B High

Baxi Section B Fault Code

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

Your boiler has lost electrical power to the pump, which means it cannot circulate water to your radiators or hot water tank.

Also written as SECTIONB — same fault.

The Baxi Section B fault code means: your boiler has lost electrical power to the pump, which means it cannot circulate water to your radiators or hot water tank.. It appears on 2 Baxi models in our database.

Technical description: No 230V at Pump or PCB - A4 connector terminals 3 & 6

Typical repair cost £180-£450 (including labour)

Engineer required

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

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Baxi models that show the Section B fault code

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

Source

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

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