When you saute off the onion etc in the first step and came to the second step, did you make sure you reset the temperature button - I made that mistake a lot when I first started using the thermomix. After each step has been done and the TMX sings, you need to reset the temp for the next step.
do a little test put 1/2 water in the *:i see how long it take to boil.i tried it. it took 4.50 mins to boil with the MC on