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The Keurig machine operates by pumping air into the glass boiler to drive the hot water through your coffee cartridge. When you have put a new cartridge into the dispenser, you select a size of cup. When you press the go button, you should hear the machine pump water into the boiler to the requested cup size (test by selecting large size to hear the pumping work). Next the machine operates an air pump to force the specific amount of hot water through the cartridge and make the cup of coffee. The problem encountered with these machine is that a small amount of water can drip internally onto the air pump and it will either not operate or work intermittantly. There is a great 'how to fix' video on utube concerning the Keurig-taking apart and fixing.
Honestly, I don't know whether this is your problem, but I do know this happened to a machine I had. You should hear the tiny air pump working when the cup of coffee should be brewing. You can laboriously take apart and replace, and given the price of these units it may be practicle to do the repair. Watch video on utube--its like three or four parts and very instructive. Sorry I don't have the link.
It could be a simple problem like the feed line from the pump to the boiler is leaking. If the unit has ever been allowed to freeze without draining the boiler your problem is serious. It could result in a blowen seal between the top and bottom castings of the boiler or worse, it will crack the bottom casting. You should be able to see by taking the white top off and observing. Remove the water tank and four screws.
If the casting is cracked it has to be disassembled and I had mine silver soldered back together. Works fine now.
Sounds very much like the element has gone. Mine went after I moved house (suspect something happened during transit). Mine was replaced by a heating technician who wasn't even an official Ascaso agent, so I guess the answer I would give would be go to a local heating systems technician/company. Mine cost a bit more than that, but I got them to change it, so if you're doing it yourself you might get it for under $100.
I had the same problem: clean showerhead, machine pumps hot water just fine,
but very little brewhead flow. Descale made it worse but that was a big
clue! I took apart the brewhead and found grains of scale in the
boiler, like pulverized beach shell:
Some of those bits apparently made their way into the three way valve and clogged it. I could not blow air through the channel between the plunger and the boiler. Not surprising: the inlet hole inside the valve is TINY and clogs easily. Once I got this part cleared up inside (and cleaned out the rest of the scale from my boiler so it didn't immediately re-clog!), my brew flow was restored.
Yes you require a special spanner which has a slight bend at the top. You can get them at most hardware or mechanic style stores as it is a type of tool mechanics would use. I believe it to be either a 16mm or 19mm. Once you have a tool that fits, hold onto nut inside boiler and unscrew the steam assembly in an anti-clockwise fashion and remove. there will be a brass washer and nut which will probably fall into the boiler. Remove these from boiler and if you go to www.theespressoshop.co.uk and click on the la pavoni machine on the right it will take you to a full parts list where you can purchase a new washer and nut. Then just re-attatch in opposite fashion.
I hope this helps.