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Remove the portafilter and activate the brew switch. Water should stream out of the shower screen. If not you need to clean the group components, or the machine is broken. To clean the group components, remove the center screw. The screen should drop down, the dispersion disk may be stuck, you can pry it loose with a flat head screw driver. Soak both of these in a descaling solution.
With the group components removed (as above) try brewing, water should stream out of a single hole. If not, you may have a faulty pump, or seals.
If water streams out normally, be sure that you are using the single espresso basket. This is the smaller basket that snaps into the portafilter, and has sort of a tulip shape.
Your group head gasket may be worn, and will need to be replaced. These need replacement ever 6 months to 12 months, and need to replaced even if the machine is rarely used, because they are made from natural rubber that dries out. Replacements can be found at many retailers online, a few are: espressocare.com, espressoparts.com, and seattlecoffeegear.com
If there is no water from the head then remove the screw and screen, then press brew button, if water flows clean shower, using a pair of plies hold screen over open flame, coffee will burn out of the small holes. If no water after trying above then remove the 2 allen wrench screws and carefully remove the diffuser and seat with spring, now try running the head, if water flows reassemble and you are back in busines, if no water descale machine.
Remove the water tank and drip tray. Then turn the machine upside down. That way you can see the gasket. Stick you allen wrench into the hole the screws were in and pry the center out. Now you can get a screw driver under the gasket and pry it out. It might come out in pieces but that is OK. They get hard and that is why they won't seal. They should be replaced once a year to work good.
Remove the shower, then the 2 allen wrench screws for the diffuser, careful do not loose the spring ad valve seat that is above the diffuser, now turn machine on to see if water will come thru, if water flows, problem is either screen or diffuser blockage, if no water then you need a stronger descaler because blockage is in the boiler, at the solenoid or from the pump. Most likely in the boiler, if you have a boiler gasket go ahead and open the boiler to clear the blockage.
try to clean the group shower which it can be ansrew by one cetrer screw and if you can you can open the machine and remove to clean also the coffee group solenoid valve. Bothe the valve and shower can be full of dry coffee that can blocked the way of water coming to the grounded coffee. If you manage to clean everything above and the machine work ok so from now on in order to avoid the problem again try to flush water from the group many times without any coffee. With this is like you wash the group shower and valve from any remai coffee. Good luck