Nespresso Citiz coffee machine - pump not activating

Hi,

I have a Nespresso Citiz coffee machine. It was working properly and in daily use. However, earlier this week it was descaled but during the descale process it completed the two descale stages but then it refused to do the rinse stages.

The machine has since been unplugged and the factory reset process applied.

Now when I try to use it:
I plug the machine in.
Press a button to activate it, both lights flash to show it is warming up.
After a short wait, both lights remain on to show the machine has warmed up.
A button (lungo or espresso) is pressed, it flashes and the other button light remains lit (I remember this being the pressed light remaining on and the other light goes off when it was working properly).
After a short while, the blinking light goes solid again and both lights remain lit.

There is no sound of the pump working. All the above happens in silence.

Any help very greatly appreciated.