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Had an old Otis controller catch fire last week in a Chicago high rise

We were doing a routine PM on a 30 year old Otis system in the Loop and smoke started pouring out of the controller cabinet. Turned out a capacitor had been leaking for months and finally shorted. Anyone else here been dealing with aging controllers that are getting dangerous?
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3 Comments
emma_garcia
Is it really that serious though? I've seen those same old Otis boxes running fine for years after people said they were ticking time bombs. Maybe a thermography scan would catch things earlier, but sometimes a quick visual check does the job just as well without all the extra cost.
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mileslane
mileslane2d ago
Man, that's exactly why we're pushing to retrofit all our old stuff before it gets that bad.
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phoenixk64
And that's the thing with these old Otis controllers, they just keep running until they literally don't. The leaky capacitor thing is a classic failure mode once they hit 25+ years, and the soot from a small fire can mess up an entire floor's air handling. You guys running a regular thermography schedule on your older gear, or just waiting for the smoke?
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