I was installing plumbing in my darkroom using equipment from my old darkroom, and on top of all the little problems I had to go through to get everything leak tight I found my Intellifaucet K250 was malfunctioning. The hot water side had seized up. After determining it was a mechanical problem I took the valve body off, comes loose after the cover is off with the two one inch nuts inside. The temperature probe needs to be carefully unplugged as this comes with the body. I took it to my vice and unscrewed the upper end of the hot side and found the slider inside caked with mineral scale. After breaking it loose I went looking for some CLR but no luck. I did find Lysol toilet bowl cleaner with hydrochloric acid in it as the active ingredient and that stuff practically melted the crud away in a heartbeat. Rinsed it all off and put it all back together and it runs like new.
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