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help. the low system pressure light has come on although the pressure guage is reading as it should be. i'v no hot water and the central heating isn't coming on. it sounds as though the gas is still coming through but the pilot isn't sparking up to heat the water. do i need a new circuit board...

how do i recharge the pressure vessel? i know where it is and to use a pump, but how will i know when to stop pumping.