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Got it sorted out guys . Thank you all very much for your advice and help. Phil

Thanks again for the help .

Hi Thanks for the reply , the Black wire is A and the grey is B here . I just need to clarify which one is 1 and 2 Thanks again

Hi . Ive just bought a new Hive thermostat , i just need a little help to wire it up , i have 2 pics 1 is what is there at the moment and 2nd is what i need help with . I know there only 4 wires 2 of which i know L/N its the other 2 wires the grey and black labeled A and B um nit sure about ...