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    Replace an old Satchwell room stat with a Siemens RAA20-GB

    Hi, My old Satchwell room stat has thrown it's hand in. I have bought a new RAA20-GB from the plumbers merchants, but the wiring is completly different. I have a Baxi back boiler and old Glowworm Mastermind clock controller. The old Satchwell stat had red to terminals 1 and 3 and 2 blacks to...
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