BoilerFaultCodesTechnical description
Incorrect system water pressure error – possible sensor damaged or pressure too low
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 reason is a slow leak somewhere in your radiator network or a faulty expansion vessel that can no longer manage the system's pressure. It can also happen if you have recently bled your radiators and haven't topped the water level back up.
This fault is more common 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.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.