Re: Zanussi ZT 685 Rinse Hold light flashing.
It thinks it’s still full of water. The problem will be the IWMS or fill matrix under the left hand side panel. If you remove that panel, you will probably find that the lower portions are coloured black, indicating the presence of food detritus, choking the tubes.
The only proper solution is to replace the IWMS. Part number 1524624-03/6, spares@ukwhitegoods.co.uk will be able to get one for you.
Power off, if you intend to investigate this youself.
Penguin45.