Jura ENA 5 Drain valve is similar but I have a problem where water and steam leaks from the nipple after the rinse has been completed. It seems like there is pressure build up and the valve cannot hold. I have 2x ENA 5 machines. I have tried 2 different drain valve assemblies and both leak on one faulty machine. Could this be related to the PCB? If I don’t turn off the power quickly when the steam leak starts, the overheat fuse will break on the water block and cause Error 1.

It seems the water heater block can not control the heat and causes the drain valve to leak steam. I have error 1 (from water block overheat). I replaced the fuse and again steam comes out the drain valve. How to test the PCB to confirm?