@bradnic So you have already checked whether the mains voltage is present on the grinder when you want to make a coffee? And you are sure its zero? In this case I see two possibilities, one slight and one serious: First check the thermal fuse, which ist clamped to the side of the grinder. You can bridge it, just for testing. The resistence should be zero ohms. If not, replace it. The other possibility is a faulty motherboard. Well, it could be fixed, but that is difficult. You have to follow the tracks on the motherboard from the connection until you reach the relevant transistor or triac. This could be one possible cause. Maybe you can find a used part to replace the complete motherboard. Concerning the parts: depends where you live. In europe its easy and rather cheap. Personally, I usually buy from the following retailer. I also provide the link to the [link|https://www.juraprofi.de/Jura-Ersatzteile/Mahlwerk/Temperaturfuehler-fuer-das-Jura-Mahlwerk::15408.html|thermal fuse|new_window=true]. Good luck!