Build bed over travel

I've very new at this.

New FF3D Pro, Build about 10 models, learning curve etc. Now suddenly when you start the build process, the build bed travels to very bottom of the unit and continues as if it's traveling to the basement. It sits there and just grinds away until I turn the unit off.

 

How can I reset to factory or stop this before there's a burn out?

 

Thanks

D

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There should be a z axis end stop switch that's not working, that's why.

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