Light Switch Does Not Always Work

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Anybody can help me with this? The light only work if switch 1 and 2

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Anybody can help me with this? the light only work if switch 1 and 2

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How Does a Light Switch Work?

How To Change A Light Switch | Beginners Guide - YouTube

Help, New Light Switch Doesn't Work - DoItYourself.com Community Forums

Anybody can help me with this? The light only work if switch 1 and 2

Is Your Light Switch Not Working? 5 Common Reasons That May Happen