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If it has stood that long and had any water in it when last used, empty water and coffee, put the pot back on the warmer plate, pour 2 cups of any vinegar into the reservoir, turn on briefly until you hear and signs of life, then turn it off again.
Allow time to pass (an hour or two) and repeat the turn on/turn off cycle until you go to bed.
Morning, turn on the machine with the pot in its place and allow the vinegar to pump through.
If this works, the old evaporated water had left calcium deposits heavy enough behind to block the flow or check-valve.
BTW, whenever asking for help. always include details such as make, model , approximate age. etc. otherwise we can hardly give you a valid answer.
There usually no fuses on a M30 dosatron unless it's the "L" shaped supplemental supply board which has a small 250V, 6 3/4 A fuse (half the size of a normal glass tube fuse). Most boards use a similar size but rated at 4 amps for the PC board power protection. The only other fuses (older models) have big 10 amp jobs for the main power to the heater elements. But this has been replace with safety relay and or high thermal limit breakers. you should be able to find both at a hardware store. The smaller fuses at Radio shack or electronic store.
Hold down the stop button for 8-10 seconds or until you hear the faint beeping sound, press button to program when you get the correct level press stop button. On some models you have to hold the button until you get the correct level then release. When you are done programming press stop button a second time to exit program mode.
The micro screen is clogged. If front panel is removed, you will see a pipe leading to each of the heads, At the bottom of this line close to the top of the drain tray there will be a fitting (you need a 17mm open end and a cressent). Make sure water is turned off and machine is cool. When fitting is unscrewed there will be 2 copper washers and a small fitting with a silver screen inside it. Clean screen and make sure that the small hole in the fitting is clear.
I had a very similar problem with my Gaggia Classic. Worked fantastic every day for two years then one day the brew head was reduced to a very slow drip. I rang some Gaggia service agents and they all said it needs a service ($100-$150). The last one I called told me to descale it before bringing it in for a service as it was probably scale buildup. I told them it wasn't a gradual thing - it just suddenly stopped and they said what happens is the scale builds up to a point where a piece breaks off and clogs the pipeworks leading to the brewing head. So, I used the instructions outlined here: http://www.coffeemachine.com.au/descalin...
At then end of the second flush through the steam head, I closed the steam vale to try and push the descaling solution back through the brew head (just dripped through again) then left it for 10 minutes again. Did the same the third time and it went to drip again for about five seconds then bingo - burst back to full flow. Hope this helps.