1. Please unplug the filament sensor and try again.   Usually the printer would work.  Because one of cable is in wrong sequence which caused protection circuit.

 

2. If yes, Would you please check the order of this line (black/yellow/red) which plug on the mother board? (Need to open the cover of the bottom)

 

 

18. Why filament sensor can stop the printer and how to fix? 

  

 

 

On the sensor side.   Here is correct cable sequence like below. 

 

      WRONG                                                CORRECT