Hi, does anyone know about problems relating to the mechanical/electrical timers on the Potterton Performa 28 (combi) boiler, we've had ours for about 5 years and never had any problems until this year when the pressure inlet ceased up, this was replaced (easy-peasy) but now the timer clock keeps loosing time - does anyone know whether this can be replaced or whether there is a quick fix (other than relying on the wall thermastate (which means the heating can be on all time - which we cannot afford at all - LOL) Insider info, gratefully received.