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If your close by when the boiler makes a noise, press the i button this will tell you an S#. What is it?? Have you any dripping hw taps?? And it won't cost you anything just call vaillant your boiler will be under warranty. Nath

What is your room stat set to? Nath

Ideally yes. But it can work open vented. Get your plumber to seal the ufh side and run it through an external plate heatex. Nath

Wired incorrectly or maybe left the link in the boiler. The outer case is part of the combustion case on this appliance. I would get your installer back. Nath

Richard has answered the question. Nath

For testing you mean?

Give ngst a call there on gelderd road. Nath

The information he is giving you is correct. Nath

External controls? Divertor paddle possibly stuck! Nath

Turn your tap down and slow the flow. Nath

Your looking at either ignition pcb or display board. I would get someone in as you have done all you can. Nath

If you look at your display on the left hand side you have 3 rubber circles push the middle one in once it says BF release. If AF appears do it again till BF reappears. Try that and get back to us. Nath

Did he leave you any paperwork? Nath

It will more than likely be leaking from the plug at the top of the radiator. Nath

One big tank and a small tank? If the small tank is full then you have a blocked cold feed. Nath

Ok has Danny has said you need to check if you have water in your system. It could be a possible blocked cold feed to your system. Nath

What boiler do you have? Nath

I believe they fit both, and cost around £2. Nath

Yeah more than likely. Which model is it? Maxima? Nath

Sounds like Relay 1 on your curcuit board has burnt out. Nath