Hot answers tagged switch
You need a "switch dummy". Also commonly called a "switch blank", "blank insert" and "blank filler". The big box stores may not carry this item, if not, electrical supply house should have available.
You have a 2-way switch. One of the black wires is probably the line and the other carries power to some other device on the circuit; they are connected together by one using the backstab connector and the other the screw. The red wire is probably the load (it's also possible the red is the line and you have two loads controlled by the switch).
Possibly. They do make gadgets designed to control a ceiling fan + light separately, using wiring meant for a light only (which is your case even though it's a fan only). They include a control module which goes behind the fan shroud, and an intelligent light switch. The module doesn't care if the fan and light are separate items. They also make lights ...
Open up the switch box, and have a look how it's wired. Without more information (photos, diagrams, etc.), the following information is an educated guess. One of the colored lines (red, black) is likely always hot, while the other is controlled by the switch. The white is most probably neutral, and the bare/green is almost certainly ground. If this is the ...
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