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Valve swap working. Still no hot water. Temporarily hot water from tap for 10 seconds boiler fires when demand from flow switch triggers. But rapidly stripping heat from exchanger. Water store below it hot. Working on the boiler today I noticed that the pipes through the exchanger would...

You answered my last question as I was typing. Lol Great stuff. Much appreciated. I’ll let you know how I get on. ☺️

Cheers Johntheo5. Thanks so much. I’ll give it a go. Do I leave the orange disconnected and insulate as The boiler will fire from control panel and the flow switch. As I understand it I only need power to the valve to actuate it.

Hi. Newbie ! Just bought a property as a project. Has an old oil fired (no gas here) mistral combi. All was good now no hot water. I’ve just given it the once over and ch heating works fine. There’s no room stat ! (Not yet anyway) Just a timer control panel. And there’s no water cylinder...