BoilerFaultCodesYour boiler has entered a safety lockout mode due to a critical internal fault or an ignition failure.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Safety shutdown and/or internal fault
What causes this fault?
This fault occurs when the boiler's control system detects a critical safety issue, most often failing to light the flame after several attempts. It can be caused by a lack of gas reaching the burner, a worn-out spark electrode, or an electrical failure within the main control board. Essentially, the boiler has stopped working to prevent unburnt gas from building up or to protect its internal components from damage.
This issue often surfaces during the first cold snap of autumn when the boiler is pushed to work harder after being idle throughout the summer.
DIY fix possible
Move the mode selector switch to the 'OFF/RESET' position.Wait approximately 10 seconds.Move the switch back to either 'Hot Water Only' or 'Heating and Hot Water' and wait for the boiler to attempt to reignite.
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