22 Emergency

Baxi 22 Fault Code

The Baxi 22 fault code means: your boiler is struggling to breathe because it cannot clear out exhaust gases properly, so it has safely shut itself down to prevent fumes from building up inside your home.. It appears on 3 Baxi models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Fault on Fan or Flue
Typical repair cost £180-350 (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 22 fault code

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

Source

Baxi 22 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 7 July 2026