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It is a good news! But I am not quite understand the OP and GP, can you plz tell me which wire should link to which port?

Thanks for your information. Yes I can return it within 14days. Is there any other wireless room thermostat I can use?

I currently have a Siemens RCU15 Room Thermostat connecting with my air conditioning and central heating(not from boiler). I have purchased a Siemens RDH10RF Wireless Room Thermostat today, got home to fit it and the wiring diagram included is not very clear and just confused myself. Ok...