turn on all the hot taps at once, see if that clears it. if not shut off the cold supply to the cylinder for a few mins until the taps stop completely, then open it up again. if still not working then may be blocked cold supply. have you had work done on your heating or water recently?
Ian
March 2010
could still be air locked" let it run for a wile , untill the spluttering stops , and see how you get on ,
mick
March 2010
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