BoilerFaultCodesYour boiler is not receiving electrical power or has shut down because there is not enough water pressure in the system.
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 loses electrical power or detects that the water level has dropped too low to operate safely. It is often caused by a simple blown fuse on the control board or a leak in the system that has drained the pressure. Without this power or water pressure, the boiler shuts down completely to prevent any internal damage.
This issue often appears in autumn when the heating is turned on for the first time, as cold pipes and radiator bleeding can cause the system pressure to drop.
DIY fix possible
Check that the boiler's main power switch is turned on.Check your home's consumer unit (fuse box) to see if a circuit has tripped.Check the pressure gauge and, if below 1 bar, use the filling loop to top up the water pressure.
Find a Gas Safe engineer
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