Unscrew and remove the switch plate.
How to fix a wall light switch.
If the switch is bad you should replace it because you can t fix it.
You can test the switch with a voltage tester to determine which is the problem.
You may also want to use a circuit tracer to identify the circuit breaker or fuse you need to turn off.
Turn off the power to the switch at the main circuit breaker or fuse panel.
How to troubleshoot a faulty wall switch.
To replace this kind of switch follow these steps.
Once the power is cut remove the switch cover and mounting screws with a screwdriver and pull the old switch from the wall.
To replace a light switch start by disconnecting the power to the switch by shutting off the breaker for the room.
Unscrew the switch from the electrical box and pull it out with the wires still attached.
If a light switch won t turn off it could be because it s miswired or just a bad switch.
Before you do any work on a switch make sure power is turned off at the electrical panel.
When a switch stops switching then it s time to troubleshoot and repair or replace the switch.
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.
If the switch is miswired it s easy to rewire.
Then use a voltage tester to make sure that the circuit is dead.