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I know that most grocery stores sell a "cleaner" or two next to their coffee filters/coffee makers/kitchen appliances section. These are usually heavily acidic, and will do a great job of cleaining your coffee maker. I've always been wary of acid in my coffee though, so I just use white vinegar. It'll do a decent job of cleaning out the coffee maker. Run a 1:1 mix of water and vinegar through your coffee maker, drain it, then run water through at least twice.
Scaleing/deposits building up in a coffee maker are signs of imperfections in the water. All tap water has it, but if you don't want to worry about it, use bottled or filtred water in your coffee pot. Plus, your coffee will taste better!
f 17 is no water flow. It usually occurs when the brew unit has not been cleaned regularly, when the coffee grind size is set too fine, or when oily beans are used. You can try to soak the brew unit in hot water for a while, and run water through it in the sink. Unfortunately, most cases require brew unit replacement. A properly cleaned and maintained brew unit should last the life of the machine.
Most likely your system needs to be de-limed. All water has a certain amount of dissolved minerals in it and when heated those minerals will precipitate out into a white, crusty material. Often this material will clog up the works of your coffee maker.
In order to remove the deposits, you have to increase the acidity of the liquid within the coffee maker. The easiest way to do this is to drain the water and then fill the maker with about 18 ounces of white vinegar that you can buy from your local supermarket.
It may take some time before the lime deposits dissolve and you may even have to use a wire probe to carefully remove any blockage of any of the holes that the water has to flow-through to get through the system.
After you've got the lime removed and the unit is working properly, run some clean water through the system and clean any external parts to make sure you don't get vinegar flavored coffee.
Remove the screw and shower screen under the brew head, make sure screen is clean, try running the head to see if water flows, if no water remove allen wrench screws, and check spring and valve seat, DO NOT LOSE SPRING AND VALVE. Try running head, if water does not flow, reassemble and descale machine.
Try this press the button for ground coffee then when it lights up press the coffee brew button, if water flows normally then the grind on the grinder needs to be adjusted coarser, if no water then the screen on the brew unit is blocked.
Check to make sure the quantity button has not been reprogrammed. To do so, push and hold the coffee button until coffee flows through. Also be sure to check the brew-unit. In some cases if the b-unit is plugged, it will not allow water to flow through. Also check to be sure you are not grinding too fine, if coffee is too fine it too will plug the chamber...........Hope it helps.
Try this, under the grouphead, there is a screw and screen, remove those, and check screen to see if it is clogged, when screen is removed press button to brew, if water flows freely then problem is at the screen, if no water flows, then it is on the inside of the machine. You will have to run a descale cycle to clear out machine. Check the folling pic for the screen location.