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Thanks It seems that I do have a Y plan but no other wiring diagrams available. Is it possible to wire up this timer as us or am I left with 2 options.. 1. Return timer to supplier and look for s unplanned timer 2. Convert to s-plan. (Is this costly?)

Hi I am trying to replace a central heating timer and I am having some trouble working out out to wire it correctly. My old system is wired with this diagram. My new system has this diagram. I have tried replacing what I thought was like for like but it hasn't worked. B2...