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Probably a couple of hours - as mentioned I lifted a couple of floorboards to check / listen for any leaks but nothing picked up this far. Think I read somewhere to drain the system completely and locate the leak via an air check - is that correct?

Thanks for your reply Terry - we have pipes between the void which hopefully someone will be able to access the entire ground floor. Do not believe there are any pipes buried below concrete. Can I rule out any issue with my unvented system?

Hi Guys Appreciate some help with my boiler and unvented cylinder system which has been losing pressure fairly rapidly over the last week or so. To date we have checked the PRV valve, expansion vessel within the boiler and heat exchanger. Yep n addition a visual check of all the pipe work yet...