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General Engineering
How does the "CLEAN" light on a coffeemaker work?
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[QUOTE="NTL2009, post: 6567433, member: 599596"] My Cuisinart drip coffee maker has a light that comes on, telling you to run it through a cleaning cycle (50/50 mix water/vinegar, rinse). In our previous home, we were on a well of about 750 ppm dissolved solids (including some iron), so I had an RO unit connected after the water softener to remove the salt that displaced the other minerals. We used that RO water for our daily coffee, for years in this maker. I don't think the light ever came on when we used RO. We moved ~ 6 months ago, and are on Lake Michigan water, which is medium soft (more minerals than the RO, but not "hard" - almost no one uses a water softener for this water). The "clean" light has come on twice now, and running the vinegar mix resolves it. But how does it "know" that cleaning is needed? I haven't found anything detailed in searches. I was thinking the time to brew would tell it that minerals were built up, reducing the efficiency of the heater, but you can brew different sized batches, so how would it know? One thought I had - could it be timing the 'pulses', or duty cycle of the heater? It does take a few seconds to heat the water to boiling, which then expands and pumps out, and then sucks in more cool water through the check valve, repeat. So mineral build up would affect that timing and/or duty cycle? Is that it, or some other mechanism/sensor? Any ideas? TIA [/QUOTE]
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How does the "CLEAN" light on a coffeemaker work?
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