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Thanks for the info those wires are indeed for room thermostat was hoping I could replace this with nest and use existing wires is this not possible.Also not got nest had to send back as screen damaged waiting for replacement to arrive so I can't proceed yet.

Hi can anyone help me with wiring heatlink. n and l to heatlink n and l. number 4 is nest 3 any ideas on 1 and 3.I know the thermostats wiring, any assistance much appreciated