F2 High

Keston F2 Fault Code

The Keston F2 fault code means: your boiler has lit correctly but the flame has gone out unexpectedly, causing the system to shut down for safety.. It appears on 3 Keston models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Flame loss
Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if other gas appliances like your oven or hob are working to ensure gas is reaching the propertyCheck if your gas meter has credit (if using a pre-payment meter)Reset the boiler by pressing the reset button for five seconds

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Keston models that show the F2 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Keston F2 fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026