Indesit Integrated DIF 16 drains after a few mins wash

I have an Indesit integrated DIF 16 Dishwasher which is circa 5 years old. We can select any wash cycle close the door, it fills with water and starts a wash. After a few minutes the wash cycle light flashes as does the power button and the machine then drains all water. It doesn’t matter which cycle I select it does the same thing? Have tried switching it off from the mains, checked water pressure going in, it obviously is draining…All advice welcome.