02 High

Saunier Duval 02 Fault Code

The Saunier Duval 02 fault code means: your boiler has detected an issue with its internal ventilation system, meaning it has safely shut down because it cannot clear exhaust gases properly.. It appears on 9 Saunier Duval 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: Air fault, pressure switch, no power to fan
Typical repair cost £150-300 (including labour)

Engineer required

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

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Saunier Duval models that show the 02 fault code

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

Source

Saunier Duval 02 fault code information on this page is sourced and cross-checked against the official Saunier Duval service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026