F2, FN or LN High
Your boiler has failed to light or maintain a flame, meaning your heating and hot water have stopped working.
Technical description: Flame loss
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check if other gas appliances in your home, such as a hob, are working to confirm your gas supply is active.If it is freezing outside, check that your external condensate pipe hasn't frozen and if so, gently thaw it with warm water.Press the 'Reset' button on the front of the boiler display.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F2, FN or LN — no call-out fees, no surprises.
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Parts commonly replaced
- Flame sensing electrode
- Gas valve
- Spark generator
- Printed Circuit Board (PCB)
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