Replacing Wireless Thermostat

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Hi,


I currently have a wireless Center thermostat and receiver connected to my boiler, over the past month it keeps switching on and off and resetting itself I have tried to replace the batteries but no luck I have a feeling it was dropped and has damaged it.


I would like to replace it with a Nest 3rd Generation learning thermostat but is it straight forward to replace as in would I be able to do this myself or do I need an engineer. I have taken the front off the current receiver and there are only 4 wires so can it be that difficult is it just a straight swap.


The black and brown cables on the current receiver to the left would be the permanent neutral and live. And the cables going into A, B would go into 2 and 3 on the nest receiver. Is that correct?


Thank you for your help.
 

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The black and brown cables on the current receiver to the left would be the permanent neutral and live. And the cables going into A, B would go into 2 and 3 on the nest receiver. Is that correct?
yes simple as that, do not make any links on the nest that you may see mentioned in other posts
 
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