Hi, i have been using alpha s200ep water heater for 3 years now. All tge while my house water pressure is not good but with the heater`s pump, still acceptable for shower. Recently tge heater's pump keep turning off by itself. The light indicators remain the same and the line fault is green but the water became cold (i donno is it because water pressure became too low or what). Any idea what the problem might be?

Thanks for the link. Will try some of the testing. I was wondering whether anyone in tgis thread had the same problem before or not.