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Is it fitted on to a plaster board or ply board wall? They're quite noisy in this installation. If it's a fan noise you'll have to put up with it, if you think it's a pump noise you can lower the pump speed settings for the heating

Isit a CDI compact or CDI classic? I'll take a guess at compact?

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WB get so much flack because people love to hate them because they're so dominant in the market. Not many on here have got a good word to say about many manufacturers. Personal opinion, For performance and customer service you won't go far wrong.

If great customer service you want the you've got to choose WB

Does the flue terminate in his property or your property? What's on the wall the flue is terminating towards

Are you sure you've got a 30i? They have LCD screens. If the boiler doesn't fire up at all when you run a hot tap then it does sound like

You'll need to wire a 230v power supply into L and N and then the thermostat wires into 1 & 3

When you run the hot water what does the temp display on the boiler screen read?

If you are certain that's it's Purely a flow issue when running hot water then you could always fit a booster pump on your hot water pipe as it exits the boiler. As long as your mains water pipe coming in can deliver the water. I did fit a pump once and the mains was so restricted that it would...

The boiler temp shouldn't get so hot that it has to cut out at all when running hot water.

I'd definitely double check the boiler hasn't been piped up backwards on the hot and cold

There's your issue then mate. It takes a minimum of 2.9 LPM to active the flow switch to get the boiler to produce hot water. If it drops your below this then the boiler doesn't think it needs to give you hot water. The boiler seems to be doing its job. Is your cold water flow significantly...

If there's just the 1 and it's 351 (you said they changed the main sensor so could have occurred then) then that's telling me the boiler isn't blocking the operation during hot water demand. If you go to page 42 in your manual on the right hand side is an explanation into how you can access...

If you go to your boiler. Press and hold the return/spanner button for 5secs this will take you to a maintenance menu. From here use the hot water up/down buttons to scroll to the 'blocking list'. If there are any errors on there make a note of them and let us know. It's on page 48ish of your...

Just to clarify does this happen from all hot taps ? And the water gets scalding hot before cutting out ?

If it's cutting out around those temps you'll be getting around 35-40 degrees it water from your taps. Is that about right ? I'm thinking the hot and cold pipes have been connected the wrong way around to the boiler.

The boiler won't display 60, it will display the primary flow temp which will fluctuate up and down. Run a hot tap and keep an eye on this display.

How hot does the water get before cutting out ? What temp does the boiler display show before cutting out ? You can isolate the hot supply by turning the fourth flat headed isolation tap (from the left) under the boiler. (6mm spanner works better) isolate this and see if any water keeps running...

You already have broken the combustion seal.on that particular boiler just to take that picture