Re: BEKO DW450 dishwasher
had similar problem on another Beko unit
try
set programme and let unit fill with water till it starts
then open door, remove filter and if the heater is on ( look for heat haze or noise) then I know the problem
open timer and change both the heater relay and the power supply capacitor
you will probably find a bubble in the relay casing where it has been over heating till it stuck
most important to change cap as well as I think relay is not closing properly with lower power. first one I did I only changed relay and it lasted 2 weeks
Dave