Searching for an answer to my problem I read the following problem and it sounds exactly the same as mine.
washing-machine-forum/bosch-1200-classixx-express-wae24162gb-running-hot-t78990.html#p426739
I have a Bosch Excel WAE 32464UK, 8 1/2 years old and no problems until recently. It has been heating the rinse water on some cycles and now, last week, heated up a 60C wash to much more than that before rinsing. It felt way beyond a boil wash! I can actually hear the machine heating the water on the rinse cycles.
Before you ask, it’s plumbed to the cold supply and has been since the machine was installed.
What I really need to know is, what the fault is, how much would it be to fix and am I better off buying a new washing machine?
Thanks in advance for any advice you can give 🙂