I looked up the user manual and the only water tank it shows is for mobile use - if you wanted to set the machine up somewhere for an event and there isn't a nearby water connection. Maybe there's an option in the menu for mobile vs fixed operation?
I'm not familiar with this specific model, does it have a user interface where you can change it's settings from "water container" present or not present?
If not I'd say you need to trick it into thinking the container is full. Look for a float switch, level probe or possibly the bottom plate...
I believe the part you are holding there is a pressure sensor. If your boiler is heating beyond the set point I would check the integrity of the heater coil, inspect the temp probe if present as it could have excess lime scale build up preventing it from getting a real time reading, the...
I'm not familiar with that brand, but commercial grinders I've worked on have a de chaffing spring at the outlet. The thin price of metal removes the static charge I believe by being grounded to the grinder body. I know it works because when they do break off the grinds go everywhere. Is there...
Take it to the hardware (nuts & bolts) aisle in home depot. They have a board set up with every nut & bolt size, standard and metric, so you can find out what size you have. Adding a pic similar to what I'm describing.