BoilerFaultCodesYour boiler has lost power or has insufficient water pressure to operate safely, meaning it cannot provide heating or hot water until reset.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault with mains supply, PCB fuse or low water pressure switch.
What causes this fault?
This fault occurs when the boiler's internal computer stops receiving a steady flow of electricity or detects that the system doesn't have enough water to function. The most common reason is a simple drop in water pressure, but it can also be triggered by a blown internal fuse or a failing main circuit board. Because the boiler cannot guarantee it will run safely under these conditions, it shuts down entirely as a protective measure.
DIY fix possible
Check the pressure gauge on the front of the boiler or in your airing cupboard; if below 1.0 bar, top it up using the filling loopCheck your home's consumer unit (fuse box) to ensure the heating circuit hasn't trippedSwitch the boiler off at the wall, wait 30 seconds, and switch it back on to reset the electronics
Find a Gas Safe engineer
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