I have a Potterton EP2001 control panel. Went on fritz a few months ago but plumber came & said the battery had shorted it so took it out & reset. No battery replaced, just left it out. All good. Then today had to turn off the electric to replace light in bedroom & now display went blank on turning back on, no heating or hot water, buttons wont do anything. I tried pressing a few but now the display has a few lines for some digits on it, but not working still & buttons do not appear to do anything still. I've tried turning off & on at the switch but that hasn't worked, neither has turning electricity off & on again. Is it just a matter of getting a new battery in it, as there is no battery in it at all right now & hasn't been since it wont on blink a few months ago. Would it be because there was no battery in it the last few times the the power was outed? Please help.