BoilerFaultCodesTechnical description
The minimum permissible level for the safe and efficient operation of the appliance is 0.5 bar. Should the pressure fall below 0.5 bar, the boiler shuts off automatically.
What causes this fault?
This fault occurs when there isn't enough water circulating within your central heating system to allow the boiler to fire up safely. The most common cause is a slow leak from a radiator valve or pipework, though it can also happen if you have recently bled your radiators and didn't top up the water levels afterwards.
This issue is more frequent in autumn when homeowners turn their heating back on for the first time, as the change in system pressure can expose small leaks that 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.