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I had a problem with the central heating in which the pump was broken, I have replaced this and have set the valve to manual and the heating is fine. I know the valve has gone and want to replace it (i am refering to the silver box which I'm told is the automated valve). It this tricky? what is...

I AM REPLACING MY BROKEN WILO 50 PUMP. I HAVE BEEN TOLD THAT I SHOULD BE ABLE TO USE OTHER MAKES AND MODELS AND THAT I DON'T HAVE TO REPLACE LIKE FOR LIKE. IS THIS TRUE? I AM A NOVICE WHO IS ONLY REPLACING THE PUMP HIMSELF AFTER A NUMBER OF YOU WERE KIND ENOUGH TO HELP ME DETECT THE PROBLEMS AND...

I have a nosiy water pump on my central heating system and need advice. my bolier heats the water no problem but it won't heat the rads. they are stone cold. I have bleed the rads and the water pump. Any suggestions? Underneath my pump there is a black box which is where the noise is coming...