Mesh bed compensation warning

[bigsub]

hello everyone, I'm having a problem probing my bed with a smart ir on a duet2 wifi.

Warning: the height map has a substantial Z offset. Suggest use Z-probe to establish Z=0 datum, then re-probe the mesh.

I use this version:
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.05.1 (2020-02-09b1)

This is the portion of config.g with endstops and z-probe:

; Endstops
M574 X1 Y1 S1 ;
M574 Z1 S2 ;

; Z-Probe
M558 P1 H5 F300 T4800 ;
M557 X10:270 Y0:235 P07:07 ;
G31 P500 X4 Y-0.5 Z2.45 ;

In homez.g:
G91 ;
G1 H2 Z5 F4800 ;
G90
G1 X20 Y0 F4800 ; go to first probe point
G30 ;

Where could be the origin of this warning?

[Phaedrux]

Please post your full config and homeall. And Bed.g if you use that as well.

https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation#Section_Establish_a_Z_0_datum_using_the_Z_probe

[bigsub]

homez.g homeall.g config.g bed.g

[Phaedrux]

@bigsub said in Mesh bed compensation warning:

Suggest use Z-probe to establish Z=0 datum, then re-probe the mesh.

Have you redone your mesh lately?

[bigsub]

@Phaedrux said in Mesh bed compensation warning:

Have you redone your mesh lately?

Five minutes ago.

[Phaedrux]

Try moving your homing position to place the probe at the center of the bed.

Are you using G32 (bed.g) to start the mesh probing?

[bigsub]

@Phaedrux said in Mesh bed compensation warning:

Try moving your homing position to place the probe at the center of the bed.

Are you using G32 (bed.g) to start the mesh probing?

Ok for homing position.
I use G29.

[Phaedrux]

Try using G32 to call it instead because your bed.g has M561 to clear the previous heightmap first.