On Sat, 15 Jul 2017 22:28:34 -0700 (PDT), wrote:

I have a wall switch to turn the bathroom ceiling fan on/off for taking showers, one night after it was turned on, could not turn off, the fan kept running after turning the switch on and off a couple of times, so I had to unplug the fan from the ceiling box. May anybody help?
Thanks in advance,
Ann
First thought would be a defective switch.