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Hi, I recently re-terminated my S-Plan central heating wiring into a new junction box to tidy things up and also to try to understand how it was wired originally before I moved into the property. I have created a diagram of the current wiring and even though the central heating is working...

Hi, First post so apologies if I miss anything out! I moved into a house around 5 years ago (UK) with a standard gravity fed Central heating System connected to a Sunier Duval Xeon 50ff boiler. In the airing cupboard there are two zone valves and a Pump and in the loft two expansion tanks one...