Your boiler is displaying an error code for a feature that isn't actually used on this model, which usually indicates a simple electronic glitch or a programming error.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: This feature is not required on this appliance
What causes this fault?
This fault occurs when the boiler's internal computer becomes confused and attempts to monitor a component or feature that doesn't exist on this specific model. It is usually triggered by a temporary electronic glitch or the circuit board being programmed with the wrong software settings during a repair or power surge.
DIY fix possible
Locate the reset button on the front control panel.Press and hold the reset button for 2 seconds.Wait for the boiler to restart and check if the code has cleared.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like FL — no call-out fees, no surprises.
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