It may just need to have the liquid quantity reprogrammed if it is a model with such a feature. Set it up as normal and press the button that causes it to make the coffee, do not release the button, keep it pressed until the desired quantity is delivered and then release it. If it is like most of the ones I have worked on the next time you press and then release the button it should continue to flow through the same quantity as you just programmed it to.
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It may just need to have the liquid quantity reprogrammed if it is a model with such a feature. Set it up as normal and press the button that causes it to make the coffee, do not release the button, keep it pressed until the desired quantity is delivered and then release it. If it is like most of the ones I have worked on the next time you press and then release the button it should continue to flow through the same quantity as you just programmed it to.