Error with G30 command

[ABDELRHMAN SAMIR ABOGABAL]

when i used this G30 command in auto bed leveling the z go down and don not stop when the switch trigeer /?????
what is the reason and how can i solve it
M561 ; clear any bed transform, otherwise homing may be at the wrong height
G90
G1 Z5 F350
G1 X-15 Y-15 F2000 ; move head
G1 Z-200 S1 F100 ; move Z down until the switch triggers
G30 P0 ; probe
G1 Z5 F350 ; rise head
G1 X-170 Y-15 Z2 F2000 ;
G1 Z-200 S1 F100 ; move Z down until the switch triggers
G30 P1 ;
G1 Z5 F350;
G1 X-170 Y-170 Z2 F2000 ;
G1 Z-200 S1 F100 ; move Z down until the switch triggers
G30 P2 ;
G1 Z5 F350;
G1 X-15 Y-170 Z2 F2000 ;
G1 Z-200 S1 F100 ; move Z down until the switch triggers
G30 P3 ; probe and calibrate with 4 parameters (as there is 4 points)

G1 Z10 F350 ;