Wired Wall Switch Failing

by HGST, November 01 2018

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I got a few Non-Neutral Wall Switches (model QBKG03LM) that fails to work after less than a year.

Even when I manually press the buttons, the lights cannot turn on. I opened up the switch and there dont look like anything is burnt. The three fuses are okay too.

I read other forums, it seems there are many people facing the same problem. May I know why is this happening? 

Thank you

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