I have a Lamona HJA 8630 integrated dishwasher which continues to get hot after the cycle has finished and has started melting plastic items that are left in there. There only way to stop it heating is to turn off the power.
Most likley the PCB allthough the machine should be checked for a Earth Insulation fault(which should be done at all times before and after a repair) unless you can do this then its engineer time. Your dishwasher is a BEKO b.t.w. PCB is one of the cheapest on the market