Section L High

Baxi Section L Fault Code

Also written as SECTIONL — same fault.

The Baxi Section L fault code means: your boiler's waste water pipe is blocked, preventing it from safely draining away the moisture it collects during operation.. It appears on 2 Baxi 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: Blockage of the condensate drain or trap
Typical repair cost £90-160 (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 L fault code

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

Source

Baxi Section L 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