My boiler is shutting down into lock out mode, but I don't know what's causing it?

It will start on reset but shut down after a few minutes, but as of now it won't kick on at all.

I checked the pilot and it is on and fine.

I would like to know if this type and model has a flash code to tell what's wrong.

By the vent there is some kind sensor/motor type setup that was making noise and now has stopped altogether.