Geeetech

Hello,
I'm having a problem with my Geeetech A10M dual color printer.

It used to work just fine. Then I attached the ''3D touch'' to the printer, and now there's a problem with the nozzle's Auto-home position and leveling corners :
The Auto-home position is lower than the printing platform. Therefore, when leveling the corners, the nozzle presses on the platform (which is already lowered/unscrewed at the lowest point possible). Also the nozzle's position doesn't coincide with the 4 corners of the platform.

I have removed the ''3D touch'' and nothing changed. I also tried to reset the printer but nothing changed.

How can it be fixed ?
Is there a way to manually fix the nozzle's position ?

Thank you.

There is a contact switch that the Z touches twice as it homes. The switch is held in place with a couple hex screws. Just turn the z up till it clears the bed, then move the switch up till the light comes on. Tighten it up and home again.