nest thermostat

[Megster2]

My existing thermostat is broken so I need to purchase a new controller & thermostat. The existing white controller (don't know the model) has KSSJ6H on the side. Is the Nest 3rd Gen Pro a direct swop/replacement ?

[Frustratedddd]

I assume you are in the UK and it's the Heat Link box you are talking about, correct?

Add a picture, and we can confirm.

I assume you are UK, and in which case we can help you sort something out.