E26 221 High

Baxi E26 221 Fault Code

Also written as E26221 — same fault.

The Baxi E26 221 fault code means: your boiler has detected an issue with the internal air flow system, which prevents it from igniting safely to start heating your home.. 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: Pressure switch
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 E26 221 fault code

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

Source

Baxi E26 221 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