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Hi I would like to say thanks for the advice that you have given,45yearsagasman, Burnerman,Agile drained system via drain cock below boiler until gauge showed zero and left open was not a lot of air in expansion vessel, I put 12 psi in is that too much or is it okay, when repressurised gauge...

yes it is the combi instant 105 HE will this make a differance as the boiler is now cool and I am getting the foot pump and pressure gauge at the ready what does it mean if water comes out? thanks

Thanks it sounds like I have to drain the full system [all the rads]or do I just open a bleed screw I have easy access to drain cock just need to attach hose, I will switch heating off and allow to cool before proceeding to next level

I presume that the heating has to be off and cold before checking the air pressure, how do you depressurise the water side, the shrader valve is at the top I should be able to get to it with pressure guage Thanks for the assistance

what FAQs and where do I find them thanks

Hi All Problem with the above worked out the prv leaks will replace part but I noticed 1 bar of pressure when heating is on pushes pressure above 2.5 / 3 into the red could there be trapped air in the system bled all rads Cheers :x