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Hi Muggles, Thank you for your reply. Am I right saying that A and B I can find in boiler control/board itself therefore need different cable to connect to boiler? Many thanks for your help.

Hi All, I have got question on installation Nest Heat link to boiler. I have got Vaillant Ecotec Pro28. I currently have Honeywell thermostat and receiver (wiring) has been shown on picture attached. Should I do exactly the same as on the picture above ie: N to N L to L With yellow/ green cable...