The water sensor is a float in the mister area of the base. The float is off in one corner with a little plastic barrier around it and translucent cap over it. Make sure the float can more freely. If the float can move up and down but the light stays on, the reed switch (a switch controlled by a magnet built into the float) inside the unit might have been knocked loose, damaged or disconnected. The switch is actually inside the post that the float slides on, but it can only be accessed from the underside - inside the unit.
Excellent - worked great! The sensor looked like a little white, thick washer. If you are looking down at the base, it is in the front half (not the circle part) in the upper-right corner. Thanks iksbob and I hope my little detail helps someone else.
Turns out I flipped my upside down after doing some maintenance. Flipping it back over fixed it.
I removed the floater screw, top and washer. After cleaning them and replacing it worked! Thank you so much for this post.
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For my 7142, it seemed that the water level switch was stuck open over most of its travel. I turned the unit upside down and shook it vigorously a few times. This appears to have reset the reed switch that iksbob mentions in the first answer. It works again - for now. Give it a try.
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Q: Unit is running intermittently.
A: How long has it been since the contents of the cartridge were
replaced? If 2-3 months have passed, it is time to replace the contents
of the cartridge. However the demineralization cartridge and or the
granules must be exchanged at the latest after 6 months or the unit
ceases operating at its full performance. If the contents of the
cartridge were just replaced there are probably too many granules in the
cartridge. Remove 2 tablespoons of granules from the cartridge.
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