My overhead light and outlet in my laundry room are not working, all of the sudden. They are on the same breaker and nothing else in the house is on that breaker. I just replaced the light switch and the outlet, and replaced the breaker that controls the light/outlet. It still is not working. I have an inexpensive volt meter that lights up 110 in the 110 outlet when the light switch is off. Weirdly, the volt meter lights up 220 in the 110 outlet when the light switch is on (but the overhead light does not go on). Only other fact to mention is that there is a 220 outlet right next to the 110 outlet. The 220 outlet has not been used for many years (it was installed and used by a prior owner who were from Europe and had European appliances). This outlet shows 220 on the volt meter both when the light switch is off and when the light switch is on. Any help of what my issue is would be much appreciated.
If you turn that switch on, it will run at 220v, probably your light runs at 120v (correct me if I'm wrong) which means that fluorescent, incandescent or led light will blow up after getting really bright depending of the type of light. Something must be wrong with the wiring in that switch-outlet.
At first glance, it seems like the switch is putting out-of-phase power onto the neutral terminal of the 110v outlet. The only reason I can imagine someone doing this is as an attempt to turn an outlet into a switchable 110v/220v outlet, possibly originally intended for the 220v outlet (I'm not familiar with European appliances, maybe some are supposed to run on 110 but use the same plug style?)
I'm also not sure how the 220v outlet reads 220v with only one hot wire to it.
Look around for another junction box, probably with a blank plate. I feel like we're not getting the full picture here, and someone switched some wires accidentally while doing work. Could possibly be in the box behind the light as well.