BoilerFaultCodesSaunier Duval F14 Fault Code
The Saunier Duval F14 fault code means: your boiler has shut down because the water inside the central heating system has reached an unsafely high temperature.. It appears on 5 Saunier Duval models in our database.
Technical description: Central heating flow T° > 95°C
What causes the Saunier Duval F14 fault?
This fault occurs when water cannot move quickly enough through the boiler to carry heat away, causing the internal temperature to spike rapidly. The most common reasons are a failed internal pump that has stopped spinning or a physical blockage caused by a build-up of sludge and debris within the pipework.
This issue often surfaces during the first cold spell of autumn when the heating is turned back on after being idle all summer, which can cause internal pump parts to seize.
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure gauge is between 1.0 and 1.5 barSwitch the boiler off and back on again to reset the system after it has cooled down
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Gas Safe Register →Saunier Duval models that show the F14 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Saunier Duval F14 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 27 April 2026