Question about Mr. Coffee 072179228578 12 Cup Coffee Maker

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Lilly expresso francis francis x5 repair

The water seems to overheat because it spatters and sputters when making coffee

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  • pvkmll Jul 18, 2008

    the coffee maker i was talking about is a Illy francis francis X5 expresso maker. not a drip so i do not think your solution applys

    thank you

  • Anonymous Mar 15, 2014

    francis francis x5 repair heating element


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Each drip coffeemaker we have had, from an $8 'dollar store' unit I used in my shop, to a $90 one has done this sooner or later.
It's caused by the decay of the bimetallic thermal switch that controls the heating element.
These devices have been used for decades to protect certain types of electronics and perform very reliably - if not asked to do it as a matter of course as in the coffeemaker.
They are required to make and break hundreds, perhaps thousands of times and I believe they develop metal fatigue that causes their make and break temps to drift farther apart.

They don't break when they should; that causes the sputtering and failure to pump as they did when new, and then they fail to close again to start the cycle until they have cooled way down.

I've tried some 'tricks' to restore their fast, non-sputtering action and nothing has worked.
The only thing that will, is replacing the thermal switch itself, and they are normally spot-welded during assembly because of the exposure to high temperatures so conventional soldering, may make the machine dangerous as it melts from the heat produced by the element.

My cheap shop coffeemaker lasted over ten years, the more expensive ones we have bought for home rarely even three years, all of them eventually taking instead of 10-12 minutes for a pot, 30-60 minutes.
Sometimes it improves (but doesn't restore) them to use a nasty acid (I tried the vinegar route first) to etch out the inevitable buildup of mineral deposits inside the tube that carries the water.

This could be solved with a pretty simple electronic circuit but they won't spend the extra couple of dollars since the current design lasts longer than anyone's warranty.

Posted on Jul 18, 2008

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