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The dumbest fix that saved a 3 hour service call
Had an old MCE elevator in a building downtown that kept throwing a door zone fault every 10th run or so. Spent two afternoons checking door contacts, limit switches, wiring, everything looked fine. Finally got annoyed and swapped the door zone magnet out of pure spite even though it tested fine. Problem went away completely. I guess magnets can get weak or something even when they still read correct on a meter.
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