BoilerFaultCodesTechnical description
Low water pressure
What causes this fault?
This fault occurs when the internal pressure sensor detects that the system water level has dropped below the minimum required for safe operation. The most common reason is a slow leak somewhere in your radiators or pipework, or a failure in the components that regulate pressure, such as the expansion vessel. Without enough water, the boiler cannot circulate heat effectively and shuts down to prevent the main heat exchanger from overheating.
This issue is frequently seen in autumn when homeowners turn their heating back on after the summer, as the change in temperature can highlight small leaks or a loss of pressure in the expansion vessel.
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.