BoilerFaultCodesYour boiler has failed to light the flame or detects that the flame has gone out, 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: Flashing slow (Burner Lockout)
What causes this fault?
This fault occurs when the boiler attempts to start up but cannot successfully ignite the gas to create a flame, or if the flame is lost during operation. The most common reasons include a lack of gas supply to the unit, worn-out ignition components that can no longer create a spark, or a build-up of carbon on the sensor that detects the heat.
This issue can become more frequent during the first cold snap of winter when components that have been idle over summer are suddenly put under heavy strain.
DIY fix possible
Check if other gas appliances, like a cooker, are working to ensure gas is reaching the propertyCheck that your prepaid gas meter has sufficient creditPress and hold the reset button for five seconds 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 FAIL POINT H — no call-out fees, no surprises.
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Worcester Bosch 24/28CDi II RSF 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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