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So you have hotwater?

The DHW temp is preset to 55 degrees. I would be getting the installer back first to go through his commissioning again. And if everything is ok but the temp is still too hot get the manufacturer out too it. Nath

Possibly or a back feed from the valve. Do you have a means of testing the voltage ( multi meter )?

But don't cut away! I meant to say.

Isolate the power. There's a terminal strip with about 5-6 choc blocks. Remove all the wires. Then locate the 2 black wires they are the T1 & T2 you have on your diagram. So one off the black wires goes to A, the other black goes to B. That's the switch wires done. You will have a L & N with the...

Faulty 3 port valve I'd say!

Remove the floor and put the insulation between the joists. Up to the height of the spreader plate as previously mentioned. If done correctly your pipe will sit level with the joist. You will be better fitting a ply lined oak floor as to stop warping. Nath

Isolate the rad your removing. Open the vent to release the pressure. Close the vent put a couple of towels under the valve. Then undo the nut if you have an extra pair of hands then get that person to cover the hole while you do the other side. Carry outside empty the drain the majority of...

Do the upstairs rads work at all? Nath

Ok I'm wrong. First time for everything I suppose! ;)

If it's the 28i RSF the dial may off broken off in the potentiometer. Or if you mean the room thermostat then it's either turned up full on the boiler. Or the links for the ex controls are still in the board. Nath

The 280 has a plate HE.

Filter or plate heatexchanger likely culprits. Nath

Yes that's correct. It's the last tee to stop reversed circulation when your hw is on. If that is the case it's just a matter of swapping the 2 pipes across. Nath

Flow and return wrong way round from the boiler.

I'd get someone else in as your mate dosent even know how to pipe size. Mates rates don't always work out cheaper. Nath

Yes the valve should off been put before the 3 port then linked to the boiler return. Even tho not needed. Shut it off snd it should be fine. Nath

No the 22mm above the pump is used for expansion.

If you felt the bottom pipe in the cylinder does that become warm before the AB. It's starting to sound like a piping fault.

If you leave the hw/ch turned off till the pipes go cold. Then turn the hw on which pipe gets warm first B or AB?