BoilerFaultCodesSaunier Duval 13 Fault Code
The Saunier Duval 13 fault code means: your boiler's internal computer is experiencing a communication error, meaning it can no longer safely control the system or manage heating and hot water.. It appears on 10 Saunier Duval models in our database.
Technical description: Main board fault
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 13 fault code
Click a model for the full fault code list and model-specific repair notes.
- Ecosy 24E Repair: £250-450
- Enviroplus Repair: £90-180
- Isofast Repair: £300-500
- Isofast F28E Repair: £250-450
- Isomax F30E Repair: £250-£450
- Thelia Repair: £250-450
- Thelia 23E Repair: £250-450
- Thema F 30 E Plus Repair: £250-450
- Themaclassic F35E Repair: £250-450
- Themaclassic Plus F30E Repair: £250-450
Source
Saunier Duval 13 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 Enviroplus manual (PDF)
- Saunier Duval Isofast manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026