Although it isn’t overtly dangerous, a leaking boiler should be switched off to prevent the chance of your electrics short-circuiting, and to stop escaped water from damaging flooring, fittings and furniture.
You should never attempt to fix a leaking boiler by yourself, and instead enlist the services of a Gas Safe registered engineer.
To learn more about your boiler and to understand when you should seek to get it serviced, check out our Boiler Service Guide.