BoilerFaultCodesYour boiler has detected that there is not enough water pressure or the water is not moving through the system properly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault on Pump or Low System Pressure
What causes this fault?
This fault occurs when the boiler's internal sensors detect that water isn't circulating at the correct speed or pressure to safely carry heat away from the burner. The most common reasons are a drop in system pressure due to a minor leak, or a mechanical failure where the pump has seized or worn out over time.
This issue often surfaces in autumn when the heating is turned back on after summer, as pump components can seize during long periods of inactivity.
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop valves to top the system up with more water.Check if any radiator valves are fully closed or if there is a blockage in the system pipes.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Neon7 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Performa System HE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.