diswaser not completing full wash cycle?

I have an Hygena APL 8224 diswasher which stops at after the first Pause during echo wash.
It will continue after pause only if i have opened the door for about 45 mins to allow it to cool down.
I have tried to turn the timer one click on but although this makes it work there is no water in the machine and the heater starts to get hot not good.
Ihave also replaced the Timer, cleand and checked the fill level micro switch & float, also cleaned all the pipes & water valve. any ideas.