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Hi Strachan When you say the diapharm wouldn't work properly do you mean the system would lose pressure quickly?

Whatever the outcome though wouldn't he have to replace this now anyway?

Surely someone out there can give me their opinion please

Our plumber has now found a pinhole in the diaphram of the expansion vessel which he believes could be the problem and believes that changing this will rectify the problem. Would a small hole in this allow the pressure to be lost so quickly? Any comments

So could we be talking of just a pin prick in the system to be enough to cause the pressure to drop so quickly or are we looking for something like a broken joint.

Should there be large amounts of water considering how quickly the pressure drops?

Yes I do use boiler to heat water, the cylinder is brand new it's a Hercal G3 with 148 litres capacity.

Can't seem to detect a leak anywhere any other suggestions.

Hi Guys New to this forum and I have logged on in desperation. I have a pressurised CH system which is run by a Potterton Prima F Boiler. I am losing pressure on the CH really quickly. I have filled the system on the loop up to 1.5 bar and the CH heating works fine. There is a vent value in the...