BoilerFaultCodesTechnical description
The current water pressure is too low, limiting the performance in heat mode as well as domestic hot water (DHW) mode
What causes this fault?
This fault occurs when the system loses the physical water pressure required to circulate heat effectively through your radiators. The most common reasons are a slow leak hidden somewhere in your pipework or the pressure naturally dropping after you have recently bled your radiators.
This issue is frequently seen in autumn when homeowners turn their heating back on for the first time after summer, revealing pressure losses that occurred while the system was idle.
DIY fix possible
Locate the external filling loop, which is usually a silver flexible hose beneath or near the boiler.Open the one or two taps on the filling loop slowly until you hear water entering the system.Monitor the pressure gauge on the boiler front or digital display and close the taps once it reaches 1.5 bar.