BoilerFaultCodesYour boiler has lost its flame while it was supposed to be running, causing the system 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: If at any time the burner is extinguished while there is still a demand for the boiler to operate the Flame Failure neon will illuminate.
What causes this fault?
This fault occurs when the boiler's control system can no longer detect a flame while the unit is trying to heat your home. It is often caused by a dirty or worn-out sensor that can't see the fire, or a faulty gas valve that isn't providing enough fuel to keep the burner lit. Because the boiler cannot confirm it is burning gas safely, it shuts down entirely to prevent unburnt gas from building up.
DIY fix possible
Check if other gas appliances, like a hob, are working to ensure gas is reaching the propertyCheck if your gas meter has credit (if applicable)Press the reset button once to see if the boiler restarts
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 Flame Failure neon — no call-out fees, no surprises.
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Potterton Osprey CF 125 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.
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