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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...

Siemens RDH10RF Wireless Thermostat

Siemens RCU15

Siemens RCU15 connection terminals&diagram