I have one of those bean to cup coffee cup coffee machines and the boiler in it stopped working. I had the boiler replaced and it popped again in a few days later. The company in Germany is not talking any more so it will be down to me to replace the boiler. I am trying to work out why the boiler blew and I suspect the little temperature sensor on the top of the boiler is defective. When the boiler popped there was a reasonably loud pop and I assume therefore that the boiler overheated. It's one of those therma block systems. The new boiler is about £60 but before I go to the expense of that, I want to make sure that the temperature sensor is functioning properly. Does anybody have any ideas how to ensure that it is operational. Many thanks for your help. Kev if you are reading this, no disrespect but I was too scared of getting flamed if I put this post on the plumbing forum.