Hi Cath, the white deposits sound like salt or soap sudds which are leaving the deposits.
I am not convinced its the softener at fault here, but the quicket thing to do is stop the dishwasher on a rinse cycle collect some water and use one of the water testing kits to see if the water is hard or not. That then gives you a base level to work from and determine if the dishwasher is actually softening the water.
You should have had a test kit which came with the softener, if not you can buy a very good kit here from tool station which should be a local shop to you.
Once we know if the water is hard or soft we can then troubleshoot further.
Hi Cath, no I havent seen a reply since my response at 9:40 on 26/09.
Can you re-post it here, and ill see how I can assist.
Hi Cath sorry for the delay in responding.
The rinse cycle is called 'soak' on your model it looks like a dish with a line through it.
Soak is the third program from the left (just before the 50 degree eco program).
Test the water and if its showing as hard then it would prove the inbuilt water softener is not working.
Yes this is correct, if the water shows as being hard this shows the softener within the dish washer isnt working.
Good morning, I havent heard back from you, do you still require assistance?
No problem, if you provide me with your postcode I can recommend someone in your area.
I would suggest Bath Wash Co on 01225 429127, I just gave them a quick call they charge £45 plus parts.
Appreciate if you can rate the service received, many thanks