Question about Stihl Chainsaw Throttle Trigger 012 O12 Chain Saw

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I have a stihi ts400 disc cutter which will not switch off on the off position when the button is push forward , any solutions welcomed !!

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Strip off the case check the contacts from the switch follow the wire back to the coil check to see it's connected. Usually it's the contacts

Posted on Oct 16, 2013


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The motor has a feature to go forward and reverse and thus the forward (paper in) control has been compromised. The problem can be the switches. A rocker switch when in one position may control the forward motion or backward motion, therefore if the switch fails only one side is working. Then there may be two small switches on the so called rollers (Cutters) that sense the input of paper into the cutters thereby starting the motion and shredding procedure. If a sensing device is broken, only the unaffected switch works. Repair is usually expensive, thus a replacement is in order.

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1 Answer

Cuts off after a couple of minutes with error mesage of E68

Hello,welcome to FixYa.

The E68 is indicating a push button is stuck, refer to this chart below for explanation and potential remedy.


The reason this is happening can be for a couple of reasons. When a button is pushed, the contact inside the control is sticking in the "closed" position, or the plastic button which activates the switch, is binding on the console and not allowed to return via the small spring which insures it does under normal conditions.

Let me know how you make out or if anything is not clear and I'll help in whatever manner I can going forward. Good luck.


Macmarkus :)

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Welcome to FixYa.

I know I responded to your other post as well, but I just wanted to make sure you got my reply.

It sounds like the kill/emergency shut switch is in the "off" position.

  • If you notice a switch ( white in color ) next to the belt pulley has a black push button on it, that is the interrupt switch that shuts it down should the belt break.
  • Push in the black button from the left ( from the back ) until you hear it "click" and you should be good to go.

Let me know how you make out.

Thanks for choosing FixYa. I hope you will take a second to rate my solution/assistance positively.

Good luck.

Macmarkus :)

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