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Finally got that 1980s Otis controller talking to the new display panel
It was a retrofit job at the old Grandview Hotel downtown, and the new panel just would not sync with the old logic board. I spent almost three full days tracing wires and checking voltages before I found a single bad relay, part number KUP-11A, buried in the back of the machine room. Has anyone else had a modern display fail because of one old relay like that?
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wyattbennett1mo ago
Check the voltage across the coil first.
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nancy_owens1mo ago
Oh, the classic "check the voltage" advice. That's the first step for like 90% of electrical problems, honestly. Might as well tell me to make sure it's plugged in.
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