BoilerFaultCodesYour boiler is starting up but failing to detect that the flame has successfully lit, causing it to shut down for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Go to section 'I'.
What causes this fault?
This fault occurs when the boiler's internal sensors fail to confirm that a flame is present after the ignition sequence begins. The most common reason is a worn-out or carbon-coated sensing electrode that can no longer 'see' the flame, or a fault within the control board that prevents it from processing the signal. Because the boiler cannot confirm it is burning gas safely, it shuts down to prevent unburnt gas from building up.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 Burner extinguishes after 10 seconds neon flashing — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Performa System HE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.