BoilerFaultCodesYour boiler has briefly lost its flame and is attempting to restart itself automatically.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Temporary flame loss – this is a temporary error, the system should reset on its own
What causes this fault?
This fault occurs when the boiler's internal sensor fails to detect a consistent flame during operation, leading the system to stop as a safety precaution. The most common reasons include a worn-out sensing probe that can no longer 'see' the flame or a slight instability in the gas supply that prevents a steady burn. It is often a sign that the components responsible for lighting the gas or monitoring the fire are starting to fail.
DIY fix possible
Wait for the boiler to automatically reset and restart the ignition sequenceCheck that your gas supply is active and that other gas appliances are workingEnsure your condensate pipe has not frozen if the weather is extremely cold
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 3 Green Flashes — no call-out fees, no surprises.
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