F2 High

Keston F2 Fault Code

The Keston F2 fault code means: your boiler has started to light but the flame has gone out unexpectedly, causing the system to stop working 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 £90-350 (including labour)

DIY fix possible

Check that your gas emergency control valve is open and you have credit on your meter.Check if other gas appliances in your home, like a hob, are working correctly.Restart 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 31 August 2026