Great question — answering as the UphillTech team:
If any hard-wired always-powered device with no wall switch controls is running and the device's power switch won't turn it off, you can turn off the room the device is wired to at the circuit breaker or fuse box. If you don't know which circuit breaker to turn off, turn each one off one by one, check if the device has turned off. Once you have the correct breaker turned off, and the device is now off or stopped, you can leave the breaker off until the device is repaired or removed. Keep in mind this may turn off other things that may need to stay on, like refrigerators or internet. You may need to temporarily plug these things into other circuits that are still powered. If you live in a...
Full answer by Triplefault: https://diy.stackexchange.com/a/333511 (CC BY-SA 4.0).
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