Owner manuals for espresso machines generally tell you nothing and the translations to English are usually sub standard. My advice for that is dont waste your time.
This is the way touch pad programming will most likely work:
Place the correct dose of correctly and freshly ground fresh coffee beans in the group handle and tamp accordingly.
Acivate & purge the group of any super hot water for whatever length of time is required to get the desired result.
Apply the group handle to the group.
Press the star button and dont let go until all the leds light up.
Within 5 seconds press any one of the buttons you wish to programme.
(.....If you do not make a selection within the 5 second window it will likely drop out of programming mode and you will have to press the star button again as previous....)
The group will start to brew in the normal way, except that it is in programming mode and will not auto stop until you again press the button (which you will do when the level in cup reaches the point that you want it to stop at.
That button is now programmed.
Start again from the top but press one of the other buttons that hasnt been programmed yet and complete the cycle as above.
Repeat until all four buttons are programmed in the way you want.
If you want to change one that you have already done, simply do that one again.
You must use a fresh puck of coffee every time for each button.
Hope this helps.
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its easy to do and you dont want unauthorised staff to fiddle this so best to do when only authorised staff, supervisor or owner are around.
If attempts at programming fail (as in, you programme something but it subsequently pours something different every time), but you have followed the above instructions consistently, then something is wrong.....very possibly the paddle wheel or sender unit of the volumetric flow meter needs replacing.
If we all think my explanation of the programming process was clear and concise and in view of the usually terrible instructions provided in so called "owner manuals", Ill see if I can sell my clearly articulated instructions to all and sundry manufacturers to insert into their manuals! :D