To troubleshoot a K-cup machine, ensure proper assembly of the machine, confirm sufficient puncturing of the K-cup on the top and the bottom, and clear the exit needle from stray coffee grounds. Be sure to regularly descale your machine.
Solve several problems with a K-cup machine by making sure that each part of the machine is securely in its place. The machine does not pump water into the machine for brewing if the water reservoir is not clicked in all the way. Remove the tank, and then replace it, and press down firmly to ensure that the activation of the sensor. Also be sure to close the top of the machine completely before brewing. If not, the machine cannot adequately puncture the K-cup.
To confirm that your K-cup machine needles are functioning properly, place a new K-cup into the machine, and close the machine completely. Before pressing the button to brew, remove the K-cup, and look to see that there are punctures on the top and bottom of the cup.
Coffee grounds logging the exit needle is another common problem with a K-cup machine. Clean this by popping the K-cup holder out of the machine and rinsing it under warm water.
It is also important that you descale your K-cup machine regularly. Empty the reservoir and fill it with white vinegar. Run brew cycles without any K-cups until the vinegar empties from the tank. At this point, there is vinegar inside of the machine. Allow the machine to sit for four hours. Fill the tank with clean water, and run a few more brew cycles without K-cups to remove the vinegar from the machine. After this, the machine should be ready for a fresh cup of coffee.