If the switch no longer makes good contact between the two terminals when the light is turned on, the power flows intermittently. The current may arc, which creates the crackling or hissing sound you hear. If you hear these sounds or if you hear a loud pop from the light switch, it's time to replace the switch.
Can a bad light switch cause a fire?
Most poor electrical connections can cause fires, including loose light switches. If the wire connections or nuts behind or on the side of the switch are loose, they may release heat and ignite other parts of the switch. If this is the case, you'll need to replace the switch.
How can you tell if a light switch is bad?
Here are four more signs that a light switch has gone past its prime.
- Finicky light fixture. We've all had that one light switch that just doesn't work right. ...
- The switch sparks. On occasion, you may see a small spark when you flip the light switch off. ...
- Noisy switch. ...
- Switch is warm to the touch.
