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Hi all,I’m hoping someone can help me out, I’m about to replace the diaphragm on the diverter valve and replace the heat exchanger, but a lot of people say don’t touch the isolation valve on the C/H flow and return as they are prone to leak after, need some advice on what to turn off to do this...

looking to instal a nest thermostat to my Worcester 28cdi boiler, I have no other thermostats connected just have a digital timer. Do anyone have any photos or wiring diagram to help me out. Thanks