BoilerFaultCodesPro F Fault Code
The Pro F fault code means: your boiler has identified a specific internal fault and is flashing to let you know it needs attention to identify the exact problem.. It appears on 1 Pro model in our database.
Technical description: Boiler has a fault for a specific error. Display will be blinking, alternating with a number or letter to show which error is detected.
DIY fix possible
Check the display for a number or letter alternating with the 'F' codeNote down any specific numbers to inform your engineerTry resetting the boiler by turning the selector switch to the reset position for five seconds
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A cover plan would handle faults like F: no call-out fees, no surprise bills.
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Pro models that show the F fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Pro F fault code information on this page is sourced and cross-checked against the official Pro service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026