BoilerFaultCodesTechnical description
Zero pressure (Requires 're-pressurising')
What causes this fault?
This fault occurs when the water pressure inside your heating system drops below a safe operating limit, causing the boiler to shut down to prevent internal overheating. Common reasons include a slow leak from a radiator valve or pipework, or a failure in the expansion vessel which allows the system pressure to escape through the safety discharge pipe.
This issue is frequently seen in autumn when the heating is turned back on for the first time, as the change in temperature can highlight small leaks or pressure losses developed over the summer.
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.
Find a Gas Safe engineer
Search the official register →