It could well be gummed up with years of coffee bean residue
Very simple to take apart. There are two screws holding the cannister. They are hidden under 5mm round rubber covers that you have to pry off. Then remove the two screws holding the plastic cover. Mark the position of the numbered dial relative to the brass burr assembly then remove it. Once exposed, you should be able to figure out why it is locked. Scrape away as much gunk as you can.
Take it all apart. You will find the big brass screw is full of fine ground coffee. Clean it carefully and put back together. I had this problem a year ago and cleaned it and added new burrs. Works like new!
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Take it apart again and check all the connections and switches, security shut-offs, and THE THERMAL SWITCH. A very small and cheap electronic device that takes and overload and will shut your system down, whatever it is. Very easy and quick to replace.
Hello, your instruction manual can be found on this link by clicking or copy and pasteing it to your browser http://www.gaggia.com/dam/bo/allegati/files/31_mdf.pdf if you are unable to obtain these instructions by copy and pasteing to your browser please message me back and I will provide my email so that I may send you them directly. Thank you Rick
if it is everything in order you change the grind buy rolling the plastic container of coffee beans(container commands to upper burr holder. If it doesn't go easy than disassemble container and unscrew the upper burr holder, carefully when it comes out, you have some pins and springs from below. do not loose or displace them.
rotate the knob to try to get out the upper holder of burr. if it does not rotate than disasemble the knob and the gears(plastic big one is attached to upper holder of grinder, the other is together with knob.
tru to rotate it manualy, with help of extra srews puted in gear holder holes.
when you get it out, carefuly clean it, look for metal parts and stones(wich sometime comes with coffee)
turn on the grinder and attach gently one marker to lower burr during spining. after you stop grinder, look if it is perfect circle marked in burr. if it is not than marked side is higher. you should consider getting it ok by putting adhesive paper under lower burr and check it again.
take an oil filter remoover for cars(the model with 3 legs and gears will do better job). 2 man required one holding grinder other one start turning left and right the upper holder(during turning hold down the brake pin.) it is bit boring and job wich requires patience. but i think you will manage it
I'm not familiar with this exact model but the problem may be either packing in the unit...since it never worked...or that the beans have jammed the unit in such a way that none are feeding to the burr. Usually, there is a way to remove the top half of the burr after removing the beans. Brush out the area and reinstall. The instructions that came with the unit should be of value. By the way, on some of these units, if the cup isn't correctly placed, it may prevent the burr from receiving flow. Enjoy!