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Thanks for the response... yes - when I refilled I just opened filling loop till the pressure went up to about 1 & 3/4 and bled the rads (till water started coming out). Is the auto vent the thing at the top left side of the boiler stuck on the end of the pipe with a plastic grub screw in...

Hello All, I've got similar problems with my potterton puma: The low pressure light came on approx two weeks ago - and when I tried to increase the pressure via the filling loop the valve fell to bits inside and the pressure kept climbing!! after mild panic I turned the mains off, and got a...