BoilerFaultCodesYour boiler has stopped working because the water pressure inside the system has dropped too low to allow it to run safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Insufficient system water pressure (min. 0.5 bar) resulting in the pump and fan being prevented from operating.
What causes this fault?
This fault occurs when the internal water pressure drops below the minimum level required for the boiler to fire up safely. The most common reasons are a slow leak somewhere in your radiator network or the pressure being manually drained away during recent plumbing work.
This issue often appears when you first turn the heating back on in autumn, as the expansion and contraction of pipes can highlight small leaks that developed over the summer.
DIY fix possible
Locate the filling loop (a flexible silver hose) underneath or near the boiler.Slowly open the one or two taps on the loop until you hear water entering the system.Watch the pressure gauge until it reaches between 1.0 and 1.5 bar, then close the taps fully.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like Low-pressure fault code — no call-out fees, no surprises.
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