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

Typical repair cost for the Baxi Section C fault is £150-250 including labour.

Section C High

Baxi Section C Fault Code

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

Your boiler is struggling to circulate water properly, likely due to low pressure or a sticking internal component that prevents hot water from reaching your radiators or taps.

Also written as SECTIONC — same fault.

The Baxi Section C fault code means: your boiler is struggling to circulate water properly, likely due to low pressure or a sticking internal component that prevents hot water from reaching your radiators or taps.. It appears on 2 Baxi models in our database.

Technical description: CH system pressure 0.5 to 1.5 bar, automatic air vent closed, or primary flow valve diaphragm damaged

Typical repair cost £150-250 (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 C fault code

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

Source

Baxi Section C 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