This is preset and cannot be altered.. Do ensure you preheat the milk frother before use.. by activating the "clean" button on the frother jug
SOURCE: descaling a delonghi magnifica ESAm04
I had this problem too. The instruction manual says to turn the steam knob only half way counter-clockwise after pressing the button for 5 seconds, but you need to turn it ALL the way to have the procedure start (at least, that was the solution with my machine). Good luck!
SOURCE: how to replace Delonghi magnifica
ha this is the same problem i had just last week at a customers house with the same machine , the knob does pull off but it is hellish tight and you feel like the valve is about to burst through the front of the machine but it does pull off, when fitting the new knob it is a good idea to put some grease over the shaft before pushing the new knob on as it's nearly as hard pushing the new one back on as taking the old one off.
regards
Ian
SOURCE: delonghi magnifica esam 4200 lost bar pressure for frothing milk
The most possible problem is that the machine have build up scale both in boiler and in pipe system. Your are still in good chance to solve it easily since it operates normal by performing a good descaling of the machine. You can buy a very good product posibly from ebay like the Urnex DEZCAL which is an excelent descaler and if you perform a couple of descling procedures in a period of one week your machine will perfom better and better.
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