Question about Bosch 12" Compound Miter Saw 3912

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Bosch Miter Saw Turned On By Itself

Our Bosch saw turned on by itself. It was plugged in however no one was near it, there was no power surge, and it hadn't been used in over an hour. We are at a loss on how this could have happened. Both the safety switch and the "on" switch work fine. No problems with the saw prior to this happening. Wondering if this has happened to anyone else?

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  • David Ford
    David Ford May 11, 2010

    I work on the Bosch tools and have never heard of this, however I think to be on the safe side I would replace the switch. It could have been a buildup of dirt and arced across to complete the circuit or the trigger possibly stuck, personally I would not take that chance. You can go to and find the switch and you might also send them an email explaining the problem


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A ghost in the machine?
That sounds like a good one for Bosch tech support. I've never heard of any saw doing that, and I bet they'd be interested to know about it...
All I can imagine is a short in the switch, some kind of power surge you weren't aware of, or a practical joke.
At any rate: Contact Bosch:

Posted on Mar 30, 2009

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