Worcester gree star 25Si clock wrong?

Hi my heating suddenly turned on earlier than usual and i see my clock on the gas boiler is suddenly reading two hours ahead of the current time. I don't see how I can change the time on it. I know how to set the timer for the central heating but this is the real time that is wrong. I am wondering if I press the reset button if it will fix it. Other than the fact that this has messed up the timer the heating is working fine. Today I turned the electric off to replace a dimmer switch and I am wondering if this caused the problem. Will the clock reset automatically???