What model of Caffee Corso do you have the problem with?
Water filters and water softeners only remove a percentage of minerals from the water, lime scale is the main cause of scale, however there are many other minerals which can build up on the element.
Have you tried descaling the unit? Alot of the machines perform a self check as you turn them on, and if they detect a high degree of scale, they will not start the element to prevent it from failing.
The issue is scale, caused by your filtered water, if the unit is locked up and unresponsive this is probably due to faulty element. You will need to take the unit into a service centre.
Hi,I am Carl and I will try and help with your question. Do the lights flash any fault codes. The descale light is likely to come on at set intervals maybe after 100 cups of coffee or so.