Your boiler is currently running a special testing mode designed for engineers to check the system's performance, which will automatically turn off on its own after fifteen minutes.

Chimneysweep function: If there is a domestic hot water demand, the product runs in domestic hot water mode and at maximum heat input. If there is no domestic hot water demand, the product runs with the partial heat load that is set via diagnostics code d.00 and in heating mode. The function is active for 15 minutes.