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Try pressing the central heating override button on the hive receiver and see if the valve opens.

Not sure about the OT but weather comp on pdhw is doable although you might have to change the c/heating 2 port head for a normally open.

Looks like an old low loss header, the wire was a ntc sensor to control the temp of the header.

Sounds like the flow switch is stuck on, it’s usually the rubber diaphragm that gets stiff with accumulated “stuff” and you can clean or replace.

I changed my way of plumbing flats to prevent leaks under the floor, I now run 15mm pipes from a manifold under the boiler to each rad, uses a bit more pipe but your not digging the floors up in a couple of years trying to find out why the ceiling downstairs has water dripping through it.

You should not have 240 on the grey when calling for hot water only, you have either miswired it (most likely scenario) or a faulty nest.

Chances are the hot and cold to the shower are the wrong way round.

And you thanked ericmark for this ?:rolleyes:

I dont know of any smart switches that will work with ordinary switches, if you change all the switches to smart switches there are plenty on the market that can do this.

You dont need a bypass so the gate valve should be closed or got rid of.

No you cant use the smart switch as it does not have two way switching.

Yes but are they attached at the other end ? what is the make and model of your smart switch ?

The most obvious question is do you have a neutral at the light switch ? your smart switch needs it to work.

Might be a good idea to find out the kw rating for the oven before giving advice.

So your system was installed before unvented cylinders were allowed , no one would expect you to rip out a serviceable cylinder for no reason but there will always be luddites.:cool:

Poor pressure through out the house (unless you put a pump in) dead things in the loft tank if the lid gets knocked, frozen pipes in the loft that flood your house when they thaw, versus Clean fresh water at all taps, good pressure for shower / quick bath filling and no pipes in loft, quite...

Maybe you could explain how a vented cylinder is more "efficient" with long pipe runs than an unvented cylinder ?

Nobody in their right mind would choose to install a vented cylinder from scratch, 18kw if fine with a 250ltr cylinder.

Ah ok then all's good.

Install looks fine but I would ask for an isolation valve to be fitted, the fitting aren't pushfit they are pressfit and ok being used on your pipework.