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I have valiant gold cover for the boiler . The heating keep.on going on when The water was heating heating up. And there was a leak under the boiler. The valiant guy came twice and on the second time noticed the diverter was leaking so he changed it since then he presurre bar keep on going...

The diverter was changed, is it costly to fix

Hi I have a valiant echo tech plus and the pressure keeps going into red. By the end of the week I have to take water out of the central heating system. I have checked the taps below boiler and they are closed not sure how to correct problem.