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Is the motorised valve opening correctly?

That should be the first thing to look at imo, especially given it’s been a week.

Did you adjust any radiator valves? X400 is a cleaner, did you add any x100? Are all flow and return valves, including any magnetic filter ones fully open?

No problem whatsoever. Don't know, maybe they should have gone to Specsavers? :ROFLMAO:

Yep, that'll do it because it's a previous Vaillant control

Check the seal for alignment, If good then either tighten more or replace the seal.

No reason for it to behave how it has then. I’ve not really encountered this before. I did have it once where I decommissioned an ebus thermostat, wouldn’t go above 50 and carried out a factory reset which got it working. Your new pcb should have sorted that though.

Yep, or change float valve for another ball type?

You may have to get a smaller syphon then. Is the fill valve height adjustable? Maybe increase the height slightly?

Insulation tape or shrink tube?

Can you turn it so the float faces the right as you look at it?

Edit.

Is it a similar size to the existing one? Photos of the cistern?

Hello David, and welcome to the forum. This would have been better in the plumbing section, but let’s not split hairs. Yes it’s been missed, you have a flow and return valve, and the return is closed. Open it and you should get your heating back on, attached a photo for clarity

If it currently runs ok on 10mm then probably stay the same. However, with plastic the internal pipe size bore is reduced when using the insert, so probably about 7mm or 8mm.

Not that I’m aware of. Which terminals was it wired to? 24v?

I think you'll be surprised that it does. I have fitted many push fit (41mm) and solvent weld (43mm) into several 1.5" traps. I can't see anywhere on that drawing about 38.1mm

If they're bi-directional it won't matter.

Could be a fault with the diverter valve. Can't see it being a D code setting as the PCB was changed. Does the temperature shut off at 50?