Engine error / motor control light + loud fans after vacation

Hello together, since yesterday a problem with my 2011 C4 155 THP. I got off the holiday on Monday after 2 weeks. A short round to the shopping turned (no 5km). On the parking lot to the home way then at engine start “Motor error – Please let repair” in the on-board computer (more or less the wording) + motor control light. Since then the cooling at the start of the engine goes on full thrust and runs after shutting off the engine also on full thrust. So I did not even after s I had not noticed any defects before the holiday. Did anyone ever notice that? What could that be? Due to the “longer” service life I might have thought of martenbiss or could anything else have changed by standing? Thankful for every tip! <3