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Shut the rads upstairs. Then balance the system. Probably just a partial airlock.

The balancing valve sounds like bypass valve which needs to be closed as not required with a 3 port. Whilst the hot water is selected check what voltage you are getting on the white wire. Nath

Link in the boiler?

I would sack the wiring centre and get yourself a wall mounted double box with a blank fascia. Then get a strip of 16 amp block connectors you'll find it a hell off a lot easier to get all your wires into the terminals. And as stated each valve as a perm live ( grey ) the ch on from the clock...

You need to put a link between Live and common. Nath

Easier with 2 people. You will need a long hose running outside. Turn the the water off. Drain the heating, remove rads and fit new valve bodies on the storks.then you will depending on set up s plan y plan you will need to remove the motorised valve. Cap the hw curcuit and cylinder return. Now...

It's a copper HE on the Standard efficiency. It's just coated. Why do you think it's needs doing? Nath

Are you getting a voltage from terminal 3? Does your temp dial adjust the temp on the display? Have you tried putting a link between terminal 3/4 Nath

Welcome. Nath

Also check your radiator valves have not developed a leak. If you had an open vented system the leak may be on the pipework. But you should call your installer back.

Ok take the caps off. Attach the hose. Then open the valve with a flathead screwdriver. Then open the tap before the valve till the pressure rises to 1.5 when the boiler pump is not spin. Then turn the tap off and close the penny valve. Nath

You will have a couple of valves possibly with a silver braided hose connected if not they should be capped. They will be either around your boiler or possibly in the cylinder cupboard. If they are remote to the boiler have someone watching the display while you open the valves to fill the...

When you bled the rad, did you refill your boiler? The gushing could be the lock shield that's been closed down abit to much. Also the grumbling could be a blocked condensate. Nath

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http://idealheating.com/downloads/manuals/203319_inst.pdf

Press the top left and right button together. Then the top right button. Then it will ask for a code. It's 17, push the top right when you have entered it. Now press the + button till it says d0 what number does it say underneath? Nath

Test that your getting 240v on terminal 4 on the curcuit board. Then if you are check the divertor valve is getting a 24vdc on the brown and black wire spike when heating is selected. If not then I'd be looking at a board fault. Nath

Do you have a multimeter?

So your getting 240v into terminal 4?

What's the heating temperature set to? Is there an umberella symbol on the display. Nath