BoilerFaultCodesSaunier Duval 14 Fault Code
The Saunier Duval 14 fault code means: your boiler has shut down because a temperature sensor has detected that the water inside is getting too hot, likely due to a circulation problem.. It appears on 9 Saunier Duval models in our database.
Technical description: CTN2 > 97°C - pump will run
DIY fix possible
Check that all radiator valves are fully open to allow water to flow.Check that the boiler pressure is between 1.0 and 1.5 bar on the gauge.Reset the boiler using the power switch to see if the fault clears.
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Saunier Duval models that show the 14 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Saunier Duval 14 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 7 July 2026