Turn off the power to the switch at the main circuit breaker or fuse panel.
How to fix a wall light switch.
You may also want to use a circuit tracer to identify the circuit breaker or fuse you need to turn off.
Unscrew and remove the switch plate.
To replace this kind of switch follow these steps.
Unscrew the switch from the electrical box and pull it out with the wires still attached.
The moving parts of a standard light switch are enclosed inside plastic casing so when the switch goes bad your only option is to replace it.
How to troubleshoot a faulty wall switch.
If the switch is miswired it s easy to rewire.
To replace a light switch start by disconnecting the power to the switch by shutting off the breaker for the room.
Before you do any work on a switch make sure power is turned off at the electrical panel.
Once the power is cut remove the switch cover and mounting screws with a screwdriver and pull the old switch from the wall.
If the switch is bad you should replace it because you can t fix it.
If a light switch won t turn off it could be because it s miswired or just a bad switch.
The single pole toggle switch is still the most popular.
You can test the switch with a voltage tester to determine which is the problem.
Then use a voltage tester to make sure that the circuit is dead.