Yes, you can continue using the bottom drawer.
If there's nothing at all at the top drawer then it's likely the electronics in that drawer have failed.
As the appliance is still under warranty you have to get the manufacturer in to repair it.
I would say that having this appliance on an extended warranty of some sort, or insurance scheme as the electronics can be costly to replace.
Good luck with it.
Let me know how it goes.
Thanks for the reply but;
Is this machine prone to this type of problem or any others for that matter?
Have I bought a doggy model
No it's not a dodgy model, just very expensive parts.
I like them , a lot of engineers don't like them as they are fiddly to work on.