Question about Keurig B100 Coffee Maker

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Delivers only small amount of coffee per brewed cup

My Keurig B100, which I have had for 2 years, has started putting thruogh only about 4 oz. of hot water per cup, so I get a small, very concentrated cup of coffee. Any solution to adjusting the amount of water coming through?

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  • Anonymous Jun 05, 2008

    yes delivers only small cup

  • rod020 Feb 05, 2009

    small amount of water

  • Anonymous Feb 19, 2009

    I had the same problem. As someone previously tried, I too took off the one-way valve on the right side of the brewer (when facing the brewer).



    I checked for blockage, deposits, etc.... nothing.



    THEN, after careful inspection, saw that the actual body of the one-way valve had a CRACK IN IT.



    Since the brewer pushes air through the tank to push the hot water through the k-cup, the crack in the valve was not providing enough air pressure/flow to get the full 8oz.



    I called Keurig and they don't have any replacement parts. Bummer.



    So I wrapped some electrical tape around the crack, and it now seems to be WORKING OK.

  • Anonymous Mar 12, 2014

    I have a B31 model. Add 6 oz of water turn on wait to heat, brew, nothing.

  • Anonymous Mar 12, 2014

    My Vue stops brewing after dispensing a small amount of water. What should I do?

  • Anonymous Mar 14, 2014

    Only half a cup coming out-also overflowed with grounds in the top and mug

  • Anonymous Mar 17, 2014

    water starts brewing cold and gets hot last few seconds of brew

  • Anonymous Mar 17, 2014

    brewing starts before water hot last few seconds water is very hot

  • Anonymous Mar 18, 2014

    does not give the correct amount of coffee a lot of times

  • Anonymous Mar 19, 2014

    I push start and some hot water come out and no more water to fill the cup and there is a noise ...

  • Anonymous Mar 21, 2014

    my keurig is not producing but a small amount of coffee no matter what setting it is on

  • Anonymous Mar 25, 2014

    hot water out overflow, not to coffee

  • Anonymous Mar 29, 2014

    Only small amount of coffee is made when activated

  • Anonymous Mar 29, 2014

    machine is always going into the prime mode we have disconnect the power and shut off the machine and where it comes back on we get a small cup of coffee

  • Anonymous Apr 01, 2014

    Water heats, pull down lever and mo water comes thru cup

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This is not a scale issue, mine arrived from the factory producing only 6oz of water. way to strong for most. called the factory, scale, scale blah blah blah, vinegar untill we were blue. bored one day took the unit apart. on the right hand side there is some clear tubing which housed a one way valve, took apart and the valve was partally clogged. removed cleaned and reinstalled, this valve works best when not fully" seated" where it belongs so reinstall gently into the hose and leave it alone. I know what your thinking scale, scale scale. wrong. still only made 6 oz cups. there is a timer device on the back wall of the front panel on the right side as you face the unit. it is adhered to the wall with two sided tape. pry it off and on the back low and behold is a timer screw that changes the length of pump run time. turn clockwise with a sharp knife or eyeglass screwdriver and retest. 9oz of water. shame on keurig for not being more responsive to its customers.

Posted on Jan 19, 2009

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This is a scale issue. All water has minerals wich builds up inside the brewer through time. All you need is white distilled vinegar. Drain the Keurig first and then fill it with the vinegar. After the heat reaches brewing temperature, open and close the drawer to run off a few blanks (3 to 4 cups is plenty). This will prime the vinegar though all the lines. Refill the tank to the top with more vinegar and let the brewer sit (on) over night. The next morning, run off more than half of the vinegar. You should see the cup sizes drastically increase. Within a few cups, you should be getting close to the original 8oz cup. Repeat a few times for good measure. Drain the remaining vinegar, then flush a couple full tanks of good water through it. After all remnants of vinegar is gone, your brewer should work like new.

Posted on Jun 25, 2008

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Just for your konwledge, this parts do not cause this probleme, and at my know dont realy do any probleme. is the leak of presure in the lower par of the water tank and the baffel (plastic disc at the end of the rod)and this leak is usaly due to broken sillicon tube on the baffel, lime on border of the lower parts of the tank or on the sillicon seal under baffel. or leak of power form the air pump, propbably atack by the rust if the one way valve don't do is job.

Posted on Jun 12, 2007

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Here's the part of the problem thast no one is addressing. I also have a B100 that delivers about 4 oz of coffee from a standard K-cup. However, when simply running water through the unit for tea, it delivers the full 8 cup! Another symptom is that the coffee K-cup comes out with a small pile of grounds on top - leading me to believe that the water is flowing in, but not flowing out properly, even though the exit tube appears clear. Does that trigger any new thoughts?

Posted on Dec 22, 2009

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I found a tell-tale rust spot on one of the B100's small motors (Located on the right when you view the B100 from the front. Evidently, some very small volume of water or steam had corroded it a little. This motor is the one that pumps the volume of water; the motor on the left operates the pneumatic system that lowers and raises to puncture and brew each cup). I took the motor off, disassembled the plastic piece attached to the top of it and cleaned that out then I used a dry lubricant to free up the shaft of the motor that had rusted and was not turning efficiently. Once back together, my coffee maker brewed again.

Posted on Feb 13, 2009

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Same problem happened to me. There is a plastic boot inside the tank that is broken. This seals the top to the tank to the center rod. Keurig will not sell me the $5 part. They would would be glad to sell me a new brewer though!

Posted on Aug 17, 2006

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I have experience the exact same problem. I dismantled the entire unit and have snipped the ends of the silicon tubes and put them back on. I can see no cracks or problems with the valve at the bottom of the stem. The pumps seem to run but I am only getting about 4oz of water to the cup. Is there a way to test pump air volume?

Posted on Nov 17, 2007

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Just fixed mine. Low pressure/water volume was due to a bad pressure sensor, light blue square just above the pump on the right side. I had a bad machine for spare parts. Sensor is made by micro pneumatics Ft Lauderdale FL

Posted on May 17, 2010

This is NOT a scale issue. Mine does the same thing. I have run vinegar through it twice.

Posted on Jul 30, 2008

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