Flashing tap light neff dishwasher

I have a neff integrated dishwasher, it goes through nearly all its cycle then beeps and the tap light flashes, I e checked supply pipe filter, I’ve checked driain filter and drain pump for debris, it seems to get plenty of water and I removed the waste pipe and about every 15 mjns it pumps approx 2 litres of water out. The water is cold ?? I can restart the machine every time and it dies the same process