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the pressure on my potterton boiler 30?

Hi, the pressure on my boiler was low, so I turned the black tap at the front till it went up, I switched on the heating, now the pressure keeps rising, HELP!!!!!
lynn, December 2010
you need to fill the system to pressure cold really.the pressure will rise as the rads get hotter.this is normal

A1, December 2010
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