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The pressure gauge starts off showing grey when the heating is switched on and as time goes on moves into the red and the finger continues to move further down into the red and finally the boiler switches itself off. Its not quite a year old and the engineer told me that if the gauge moved into...

Help since I turned on my central heating the pressure gauge is now showing red! It was ok on just hot water but every time I switch on the heating as well it creeps up gradually to red until it switches itself off as a safety thing. When we turn it back on it starts rising again. The taps...