How do you clean a Bosch B25L (TDS2510GB) using the calc'n clean facility?

Are you sure that you have the correct settings chosen? It sounds like you have a faulty unit!

see the instruction from your manual:
Check the owner's manual for your iron to learn the manufacturer's suggestions for cleaning, what water to use, and storage tips.
Soft-water systems add minerals that can harm an electric steam iron and your clothes so don't fill the iron with softened water. Instead, use filtered or distilled water.
2) if the iron does not heat a( test the power cord for open or defective b) and thermostat for adjust c) test the thermal fuse d) test the heating element for open.
God bless you

I just fixed mine - it had exactly the same problem.

First, though, check it's not within the Bosch TWO year guarantee; if it is, they'll either fix or replace it.

If it's not under guarantee then the problem is probably the rubber tubing that connects the external steam tube to the hotplate. You'll need to dismantle the iron. Mine had split right next to the spring clip that holds it on. I shortened it, clipped it back on and all is now well.

Though tpmy iron is heating up it won't take the water in and so doesn't steam It has been cleaned and no scale is in the bottom. It worked fine yesterday.

Here you have how to solve this issue. It has been obtained from the device's manual.
2. calc'n clean The "calc'n clean" function helps to remove scale particles from the steam dispenser. The iron includes a system to warn when the dispenser needs periodically cleaning. When the "calc 'n clean" symbol lights up on the navigation display the dispenser needs cleaning. Fill the water tank. Plug in the iron and select the temperature setting . After the necessary warm-up period, unplug the iron and hold it over a sink. Position the steam regulator to the "calc'n clean" position and keep it in this position. Gently shake the iron. Boiling water and steam will come out, removing any scale or deposits that might be there. When the iron stops dripping, position the regulator to the position. For improved descaling, heat up the iron again fully and press the steam button several times in quick succession. Then wait until the remaining water has evaporated from the soleplate of the iron. Once it has been cleaned, the cleaning warning must be cancelled on the navigation display. To do this, simply press and hold the on/set navigation key for more than 5 seconds, with the iron plugged in. If you do not do this, the cleaning icon will remain lit. 3. anti-calc The "anti-calc" cartridge has been designed to reduce the build-up of scale produced during steam ironing, helping to extend the useful life of your iron. Nevertheless the "anti-calc" cartridge cannot remove all of the scale that is produced naturally over time.

Hi
I too had the same problem. I emailed Bosch (via their website and gave them the model number and they have emailed the instructions.
This should have been with the iron in the first place!

Is this it? http://www.bosch-home.co.uk/our-products/ironing/ironing/steam-generators/TDS2556GB.html?source=browse

The left hand column of that website has a "download product manuals" link, follow that, click "Click here to download product instruction manuals." then the model number is TDS2556GB/01

I have a bosch sensixx b25l and it has started spraying brown water all over the clothes how do I descale it please

yes my bosch did the same but then it started working again only to pour vast amounts of water all over the clothes

The cleaning process is to fill up, heat to max, then hold steam lever across to "calc and clean" position whilst shaking gently over a sink.

Manual is available to download from Bosch.co.uk.