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Sigh. Some days....
The wiring in the old bedroom is, well, old. There is no AFCI breaker. It's entirely possible there was some issue in the fan.
The remote control receiver has hot and neutral inputs. When I said it had "only one hot lead" I meant as opposed to two hot leads, not that there was no neutral. There are two hot and one neutral leads going out to the fan/light assembly.
We do not know exactly what was on at the times the breaker tripped. (There are no outlets on the breaker, only light switches & fixtures.) However the breaker did not trip until I swapped the fans, leading me to presume, pending further evidence, that the problem was with the fan or its installation.
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