BoilerFaultCodesSaunier 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 10 Saunier Duval models in our database.
Technical description: Air fault, pressure switch, no power to fan
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.
- Ecosy 24E Repair: £120-£250
- Ecosy 24E Repair: £150-300
- Isofast Repair: £150-300
- Isofast F28E Repair: £150-350
- Isomax F30E Repair: £120-350
- Thelia Repair: £150-300
- Thelia 23E Repair: £150-250
- Thema F 30 E Plus Repair: £150-300
- Themaclassic F35E Repair: £150-250
- Themaclassic Plus F30E Repair: £150-300
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.
- Saunier Duval Ecosy 24E manual (PDF)
- Saunier Duval Isofast manual (PDF)
- Saunier Duval Isofast F28E manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026