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Sorry this brewer is usually set up for a full pot brew. I have reset this for a small (but not half) pot brew as the customer wanted to use a metal carafe (with their own logo). I also tried once to get it to half pot brew but it can get tricky if you actually brew twice to get a full pot (in the same pot).
* there is a siphon action that starts once the boiler tank gets filled to a certain point. From that point it will continue to flow until the boiler is emptied to the level that stops the siphon action and leaves enough water in boiler to reheat for the next brew. Achieving the siphon point may be a larger volume of water for 1/2 a pot but may work for 3/4ths a pot. The 1/2 way mark may be affected by the brewers "level" while placed on a table or sagging in the middle of a weak table.
* Usually if you want a smaller brew then go with a smaller brewer. Though there is a hot water tap that will give you 2-4 cups of hot water (it gets tepid after that) which you can use for the "Mug" style brew. But it does get messy.ukeboy57
* Final, If you don't mind a little more than 1/2 pot brews then ask your vendor to adjust the machine for you. Though a reminder NOT the double brew in the same pot as it will overflow.
It sounds to me like the Timer board is damaged, to test it set the small lock lever on the board to on (hopefully you have the electronic timer board in there) then select the cycle half or full then hold down the brew button until you hear 3 clicks then release. After about 1min or if using a measuring pitcher stop the brewer a 2ltrs, by turning the on/off switch off. Wait until flow stops then check water level and note. Turn brewer back on and press and release brew button and this time if it stops and gives you the same amount as you just got when programming then the timer is fine, just recalibrate it for full brew using the method above.
I have the same problem with the exact same coffee maker I have tried pushing the 1-4 cups button. That worked for a couple weeks, now it is back to only brewing half the water in reservoir whether I push the 1-4 button or not. It is very annoying.
some of these coffee makers have feed tubes, which can be seen in the rear water reservoir, that feed the hot water to the grounds. some of these tubes collapse when the boiling water passes through them , then kink , causing the water to stop flowing untill it either cools or is straightened. To check and see if this is occuring.. look in the back reservoir, if there's a tube running through it, note how soft it gets as it starts to brew.. be careful the water inside the tube is hot.. This indentify why it stops brewing partway though..
Sounds like dosage is too high and grind is too fine.
Rule of thumb with any saeco unit.
Do not grind any finer then 2 or your looking for trouble.
Open grinder, clean it out with a vac. Slapped it back on.
The reason it stops is grind is too fine, and the machine doesn't have enough pressure to pass threw the grinds, creates back pressure in the machine and the unit failsafes after a certain amount of time with and pressure.