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Enjoyable read. Tony has been shown up, yet again. The Protherm Jaguar. Rests in CH. When in DHW mode diaphragm pushes pin into a micr-switch. Take that switch out then what would happen Tony?

Flushing it how? The system will need to be drained, unless you have a flush machine. Filling the system up and bleeding the radiators does not give any system a way to rid all the air still bubbling up within an hour. Harder if it's sealed. And don't mouth off if somebody more experienced as...

You shouldn't do that, it needs linking in the wiring centre and any neutral made safe. You need to find the switch live from prog to room stat. Link that out. Use live from prog to brown on the CH valve. Your HIVE wiring looks a mess. Number 2 terminal is not used, are these wires live or dead...

Popcorn out ready.

How much would you expect a garage to re-connect your exhaust on you car? I don't know, I'd expect it to cover parts and his costs and time. Call someone local and get quotes. I can do it for a fiver.

Just copy what is in. Yes the HIVE needs a L and N plus E. The switching is done by 1 in HIVE and sent via 3. You really can't go wrong.

Your friend :D

It's airlocked or you've bodged it. How have you confirmed water is passing through it? A simple job. If the old rad performed good and hot as you say, it's what you've done.

New one on me these clamps.

Yes that'll make things better. :)

Why do you want to change it?

What could possibly wrong with it? Thank you. It's a bag of sh!te! Are you on plastic pipe to radiators perhaps? You say hex was changed because it was blocked, what with? Most likely a diverter fault and it's going round the internal bypass.

You don't need it if you link Live and 1 on HIVE backplate.

And don't forget, SAFE ISOLATION! ;)

yep, you can use 1 with your grey from backplate, just easier to use link L to 1 on HIVE backplate.

Take link out 1 and 2. Live and Neutral to mains, link L and 1 in backplate and black to 2 on X4, make sure your clock is turned to ON.

L and N to mains, Link L on backplate to 1. Use the black to grey on X4.

Can you post a pic of the X4 connection?

Where are 1 and 3 going from the HIVE backplate? Be careful with this boiler because if you fry one or both of them boards they are obsolete.

Yes but the OCD in him says it matches all the others upstairs. :D