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Have you google 3port valve wiring?

So you've removed the reciever which the "wireless" thermostat controls?

LOL

So after you've carried out those connections, once the old thermostat is removed it's all working fine?

Well then it's an easy wire up, carry on

Sorry I didn't pick up on the uv bit lol. Fairly basic stuff then, surprised your asking?

Without being in front of the problem it's not easy to give a definitive answer. But it sounds like a new stat and receiver, is it a relatively new thermostat?

Heating and hot water wiring isn't rocket science but how it has been carried out can some times confusing, I've not personally dealt with nest, you may get better advice in the electrical forum. Your system is probably priority hot water. As I say I'm not familiar with nest but it probably...

Hope the change over goes well 👍

Personally I've found wireless thermostats to be a continual problem. Have you tried resetting?

Or even better fit some isolating valves for future maintenance

As a side note why join the coil, just cap off?

If there's no emergency then do it all once

Is it a pumped or unpumped processor? Ideally each unit will have it own supplies

Aqualisa Quartz ? Do you mean running off the same processor?

Ideally trvs should be fitted but am sure Bc wouldn't notice 😁

It's always fascinating to read threads with pages dedicated to chemical formulae, ion interaction and co valences etc but rarely useful. Whoops wrong thread 😁

Is it me missing something or the fact the op has wound down their prv been ignored?

And my cooking is rubbish 😁

Sorry if I came across a bit terse. Ps. Qualification is no guarantee by any means. Hopefully you will get it sorted 👍