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No i havnt yet only valliant eng. he did drop test isolation and although he drained off to cool down before test he only drained from 1st floor as all ground floor feed from above due to solid floor. Therfore when he tested after 3hrs it had only lost 0.1bar. This in my opinion could be due to...

Yes already done but when previous pressure drop outlet is adj garage door easy to see if wet on concrete

No we dont have any air in radiators never have since this boiler installed. Used to get it all the time with old boiler with open vent and header tank. Also went from may 2015 when boiler installed to Jan 2023 with no pressure loss ever. Since then lost pressuse 24 feb 23, after which heat...

Not as if pressure /water loss happens daily or weekly last ime 9th Feb till 21st Mar

Thank you yes appreciate pressure drop overnight with temp cool down drop. When my boiler loses pressure from 8.30 pm switch off at say 1.8bar at 6.30am failiure to start as pressure is 0.4bar no signs of water loss on sysyem or PVR drain very strange. As you say 1.6L of water is a lot not to...

Hi all thanks for responses No pipes buried in floor. no damp platches on ceilings. Solid ground floor no signs of damp under carpets wher pipes come down hidden Normal pressure is at 68deg flow temp is 1.8bar.When drop test done it was set to 3bar. Only lost 0.1bar after 3 hrs. But temp drop...

Inastalled 2015 no pressure loss issues till Jan 2023 lost pressure overnight F22 low pressure Recharge back to 1.8 bar Lost again overnight end Feb2023 No system leaks Re[placed Heat exchanger internal leak and recharged expansion vessel under warranty Ok till Nov 2023 losss again overnight...