BoilerFaultCodesTechnical description
System pressure is falling. It is advised to top up the pressure (status display will flash).
What causes this fault?
This fault occurs when the water pressure inside your heating system drops below the ideal operating level. The most common reasons are small leaks from radiator valves, air being released through the vents, or the expansion vessel losing its air charge over time.
This issue is frequently seen in autumn when the heating is turned on for the first time after summer, as the change in temperature can highlight minor leaks or trapped air.
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the valve(s) until you hear water entering the system.Watch the pressure gauge and close the valves tightly once it reaches 1.5 bar.