Your boiler is struggling to start up because a small internal fuse has failed, which prevents the electronic control system from receiving power.

Please wait, initialisation in progress. 24 V fuse blown.

What causes this fault?

This fault occurs when the boiler begins its ignition sequence but fails to establish or maintain a stable flame within the required time. The most common reasons are worn-out spark electrodes that can no longer create a spark or a faulty gas valve that isn't delivering enough fuel for the fire to light. Because the system cannot confirm the presence of a safe flame, it constantly resets to protect itself.