Hotend not moving down to bed

When slicing with ‘Curaengine’, when the print begins the hotend doesn’t go down to the bed. However, when slicing with ‘Slic3r’ it works perfectly fine.
I can’t see any settings which could be causing this as when printing objects previously it has worked fine. I thought it may have been the file so downloaded a different file and it still didnt work.
What could be causing this?

[quote=“LMB20”]When slicing with ‘Curaengine’, when the print begins the hotend doesn’t go down to the bed. However, when slicing with ‘Slic3r’ it works perfectly fine.
I can’t see any settings which could be causing this as when printing objects previously it has worked fine. I thought it may have been the file so downloaded a different file and it still didnt work.
What could be causing this?[/quote]
Post your curaengine start g-code please.

; Default start code
G28 ; Home extruder
G1 Z15 F{Z_TRAVEL_SPEED}
M107 ; Turn off fan
G90 ; Absolute positioning
M82 ; Extruder in absolute mode
{IF_BED}M190 S{BED}
; Activate all used extruder
{IF_EXT0}M104 T0 S{TEMP0}
G92 E0 ; Reset extruder position
; Wait for all used extruders to reach temperature
{IF_EXT0}M109 T0 S{TEMP0}

[quote=“LMB20”]; Default start code
G28 ; Home extruder
G1 Z15 F{Z_TRAVEL_SPEED}
M107 ; Turn off fan
G90 ; Absolute positioning
M82 ; Extruder in absolute mode
{IF_BED}M190 S{BED}
; Activate all used extruder
{IF_EXT0}M104 T0 S{TEMP0}
G92 E0 ; Reset extruder position
; Wait for all used extruders to reach temperature
{IF_EXT0}M109 T0 S{TEMP0}[/quote]

Put these 2 Lines at the end of your start g-code :
G28 X0 Y0 F{Z_TRAVEL_SPEED}; home x,y
G28 Z0; home z