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Great website - my second post but I'd like to ask all boiler engineers a question if I may please? On a PCB inside a boiler what parts does it contain - I know it's the electronic part that sends out and receives voltages from other components, but how does it do this?

One of the isolation valves underneath my boiler has developed a leak, and the pressure drops regularly due to this :( What's the best way to change it - drain down the primary system - and what type of valve can I fit - will a 22mm ball-o-fix compression swap be ok? Probably need to alter...