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Can you eloborate? Boiler has only just started dropping. No joins in underfloor circuits so I'm struggling to accept that it's leaking from one of the circuits. Why would there be a hissing noise at manifold from a leak somewhere underfloor ? I thought leak would more likely be on radiator...

Hi, I have part underfloor heating & part radiator system. The boiler is losing pressure, so I feel there is a leak somewhere. I've noticed the underfloor heating manifold hisses around the flow gauges when the heating is turned off (when cooling) Is it normal to hear hissing at manifold or...