Like anything else, I'm sure they can fail from time to time.
The older mechanical ones used a ribbon of a material sensitive to moisture that would change in length in response to changes in humidity, thereby operating a microswitch.
Newer, electronic units use a sensor made of a material who's resistance varies with changes in humidity, and an electronic circuit that produces an on or off signal in response to changes in humidity vs. controls setting.
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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