Thanks house_doctor,will try this and let you know the result.
As I’ve often said on this forum I come from cam switch era and never fully got to grips with the electronic era.
This seems to occur when operator changes prog selector during operation. Try this. Select a wash prog switch on. press start. you should now have only the wash light lit. If the light to the right of wash is lit also, you have not yet cleared previousprog. If only wash light is lit, it should then fill. Had this today. Machine now fills and agitates, but no heat. heater tests ok. going back tomorrow.