Re: SMEG DWI 612
Apart from checking the usual Bobby, as the appliance is only 8 months old, you will need to call the service agents out to sort this one for you.
Have a look in the user manual for the troubleshooting guide which should be in there.
It will refer to fill and drain hoses and the filter mainly.
If these are all OK then there’s little else you can do yourself really.
Smeg service (Servevast) are here http://www.smeg-service.co.uk if you need to contact them.
Hope this helps.
Dave.