Your boiler's internal computer has become confused after several reset attempts and has locked itself out for safety.

Reset error.

What causes this fault?

This fault occurs when the boiler's reset button has been pressed too many times in a short configuration or if the internal computer has encountered a glitch during the startup process. It is essentially a software safety lock designed to prevent the boiler from being repeatedly forced to start when a different underlying issue might be present. Usually, a full power cycle is needed to clear the memory and allow the system to try again.