No heating or hot water and no idea whats wrong !!?

I have no heating or hot water and nothing on the display of my ideal condenser boiler to indicate why, despite going through the motions of a restart. We originally thought that the outer pipe had frozen but have been on for hours with hairdryers and hot water bottles, then went through the start up procedure again - but still nothing.Usually an error code flashes up on the display but the display is just blank - Any idea what could be wrong