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Thank you so much and That gives me peace of mind. Thanks again and have a great weekend!

Thank you. Does it matter which black wire goes to which or just wire them to C and NO? Thank you for your help.

Also the black wires are labelled on the Vokera wiring diagram as I and O if it helps?

Hi Eric, sorry from the picture of the existing thermostat, which wires would be Com and No - it’s not easy to tell as two wires are black and the other are live and neutral? Many thanks Alex

Thank you so so much and that’s easier than I thought!

Sorry for any confusion, the photos show the current Vokera Wireless Programmable thermostat wiring that I am looking to replace with the Nest Heat link.

Yes it is. The heat link has two rechargeable batteries and connects directly to the boiler hard wired and wirelessly to the Nest thermostat. Thanks.

Hi, I am looking for some advice. I bought a Nest e Thermostat to replace the wireless programmable thermostat on my Vekera Maxim 29 boiler but I am not sure of the wire connections. The Vekera thermostat has L and N then two black wires connected to CN4 and the other to the adjoining block but...