BoilerFaultCodesTechnical description
Upper water pressure (>2.7b)
What causes this fault?
This fault occurs when there is too much water volume in your heating system, pushing the internal pressure beyond the manufacturer's safety limit. The most common reasons are the filling loop being left slightly open, or an internal component like the expansion vessel failing to manage the pressure as the water heats up.
This fault is more common when turning the heating on for the first time in winter, as the expansion of cold water can expose a failing expansion vessel.
DIY fix possible
Check that the filling loop valves are tightly closedBleed water from a radiator using a bleed key to reduce pressureMonitor the pressure gauge to ensure it returns to between 1.0 and 1.5 barReset the boiler once the pressure is within the normal range