Had the same on bosch smv40t10gb. It was the float switch that had been blocked by a lemon pip that was caught in all the gunk that builds up. I took the whole plastic float tank off and washed it out with hot water and washing up liquid and it finally came out along with all the gunk and now everything seems to be working again. Not a quick job though and going to order a new flat tank as it looks like it will gunk up again over time. Hope you fixed yours ok