Hi THERE, i HAVE AN IMERSION BOILER AND ONE OF THE MOTORISED VALVES KEEP STICKING. I HAVE BEEN ALRIGHT WITH UNSTICKING IT EVERY NOW AND AGAIN BUT I JUST WANT TO GET IT CHENGED ONCE AND FOR ALL.
I HAVE 2 VALVES, 1 IS THE PLASTIC COVER DRAYTON COVER ONE AND THE SECOND IS A METAL LOOKING 1 AND...