Technical description
The boiler has been installed for more than 1 year.
What causes this fault?
This message is triggered by an internal timer within the boiler's control board that tracks the time elapsed since the last professional inspection. It is not caused by a mechanical failure, but rather by the system reaching its programmed 12-month milestone for modern safety and efficiency checks. Once the service is completed by an engineer, the timer is reset to clear the notification for another year.
DIY fix possible
Check your service records to confirm when the last professional service was conducted.Book an appointment with a Gas Safe registered engineer for an annual service.The engineer will reset the service timer once the maintenance is complete.