I have an Alex Duetto II I've been using successfully for almost a year now. Only have had to replace a leaky pressure relief valve, but nothing else until now.
This morning, I attempted to adjust the temperature of the main boiler using the PID controller. However, when I pressed both left and right buttons at once (to enter adjustment mode), I was unable to enter the adjustment screen.
Upon further research, I found a way to "reset", as well as enter "diagnostic mode" on the PID controller, which required holding both buttons at once while powering on. I kept getting the screen that you're supposed to get when only the RIGHT button is held down. This leads me to believe I somehow lost function of the left button.
This happened out of nowhere. Does anyone know what I can do? I'm currently unable to adjust temperatures on my machine. I'm considering just taking apart the controller and rebuilding it, but wanted to seek advice here before taking any further action.
Image of the controller, for reference (possible left button not responding):