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1.5 - 1.6

Sorry, not very technical as you can tell - it stays on or around the red needle when I set the black one to match on the pressure gague. That's if it operates normally - now on the central heating setting it almost immediatley starts to loose pressure and the needle heads towards the red within...

It goes to 1.5 when I have re-set and re-pressured it and then steadily drops until it ends up in the red zone

My Potterton has started to loose pressure when the central heating is switched on (hot water appears fine) with the needle dropping into the red and the low pressure light coming on. If I re-pressure the system it starts working again Ok but there is water dripping out of the bottom of the...