1) Before powering on the machine, ensure that the probe tip is straight (not bent) and can manually be pulled down and pushed up without any resistance.

BLTouch Probe Tip

2) Next, turn the printer on and observe that the BL Touch probe deploys and retracts twice. If this behavior is not observed, proceed to the next step. 

3) If the probe does not deploy and retract when the machine is turned on, use the 2.5 Allen wrench included with your 3D printer to carefully remove the BLTouch and check that the wires are correctly seated on the back of the probe. Once completed, confirm that all the relevant BLTouch harnesses are correctly seated on the board.

4) Once the harness connections on the probe and the board have been checked, turn the machine on and observe that the probe deploys and retracts twice. If not, proceed to step 5.

5) Once you have confirmed that all the harnesses are seated correctly and the probe does not behave as described, use a multimeter to ensure continuity along each wire or contact Technical Support at MatterHackers (tech@matterhackers.com).