BoilerFaultCodesYour boiler has failed to ignite and has locked itself out for safety, meaning you currently have no heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Failure during start up – ignition unsuccessful to start
What causes this fault?
This fault occurs when the boiler tries to light the flame but fails to detect one after several attempts. The most common reasons are a lack of gas reaching the unit, worn-out spark components that can't create a flame, or a faulty internal valve that isn't releasing fuel correctly.
This fault is more common during extreme cold spells, as external gas meters or pipes can freeze and restrict the flow of fuel to the appliance.
DIY fix possible
Check if your home has gas by testing another gas appliance like a hob.Ensure your gas meter has credit and the isolation valve is open.Wait 5 minutes and then press the 'Reset' button (indicated by a flame with a cross through it).
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like F.28 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.