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The flow and return that come out the top of the boiler don't have any isolation valves on them. It seems my only options for isolation are by the tank (unless I'm not seeing something). When I returned home I checked the pressure of the expansion vessel (via the Schrader Valve) and it had...

Would me not closing the isolator valve (orange circle) on the pump take out the boiler? No water in tundish or outside outlet

I have a Kingspan Range Tribune Unvented Hot Water Cylinder (on 3rd floor) with an Ideal Logic 15 Boiler (on ground floor). Whole system is only 4 years old, as is the house. No obvious signs of leaks anywhere. No water coming about We put the central heating on for the first time since the...