Technical description
Restart boiler by pressing RESTART.
What causes this fault?
This notification appears after a new Printed Circuit Board (PCB) has been installed to ensure the boiler’s software correctly recognises the hardware change. It is a safety and configuration step triggered because the boiler needs a manual confirmation to synchronise the new components with the system's memory. Once you press the restart button, the boiler will verify the installation and resume normal operation.
DIY fix possible
Locate the 'RESTART' button on the boiler control panelPress the 'RESTART' button firmly onceWait for the boiler to complete its startup sequence and return to the normal display screen