Re: di 620 dishwasher
As you haven’t told us the make I will have to guess that it is a Hotpoint/Indesit appliance. 😉
If it is then it is a heater related fault. Very common on these Indesit made machines. It will almost certainly be either the heating element itself or the control module, both of which fail in alarming numbers. 😥
If you have suitable test equipment and know how to use it then you should first check out the heater, after removing the mains plug of course.
Jim.