Yesterday my wife went through and replaced several receptacles and single pole switches. Most seem to be working fine, but now an entire breaker will not work (just the light fixtures, the outlets work). Interestingly, it is just switch controlled lights that aren’t working. Further, when I test the switches and the light fixtures themselves the tester trips indicating there is power, but the lights do not turn on. These are all ceiling lights I’m referring to. The outlets on the same breaker are working fine and power whatever I plug into them without issue - so it’s not like the breaker is blown or anything.
All of the switches are single pole so technically it shouldn’t be possible to wire them “incorrectly” as far as which screw receives which of the two wires. I’ve removed a few of the switches and confirmed the wiring is appropriate.
Is it best to just remove every single switch and ensure there isn’t anything loose? They are all individual so I wouldn’t think that one being “bad” would affect all ceiling lights on the same breaker, but I’m no expert.