I have just purchased a Bezzera BZ40 volumatic, I am having trouble programming the dosage. I have tried holding down the centre button until it blinks, then pressing the single dose button (top left) at the same time. After dosing 15mls taking finger off single dose button and centre button. Then when I try the single dose button (with basket charged with coffee) it continues to flow until I press the single dose button again. The same happens also with the double dose button (bottom left)
Any help would be appreciated.
Any help would be appreciated.

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