Your boiler has stopped working because it has been reset too many times in a short period, likely triggered by an underlying recurring fault.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: 5 x Boiler Resets in 15 mins
What causes this fault?
This fault occurs when the boiler's safety system detects that it has been reset five times within a fifteen-minute window. It is a protective 'lockout' designed to prevent further damage or safety risks while an underlying, unresolved issue keeps causing the boiler to fail. The root cause is typically a recurring ignition problem or a failing component that is preventing the boiler from firing up correctly.
DIY fix possible
Turn the power to the boiler off at the fused spur switchWait for 30 secondsTurn the power back on to clear the lockout memory
Find a Gas Safe engineer
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A boiler cover plan would cover faults like L5 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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