Do you want to run diagnostics? Why did you change the actuator? Press cancel twice and unplug the unit. Did it work again? Have you checked the cold water valve. Most likely what has happen though, you pressed the start button to long. It is very easy to do this. I have done many service calls where they have pressed the button more then a quick press to start it. So just try, press the cancel and see if it comes out of pause. One quick press, less that 3 seconds. If you need more help, I am here.