Additional Note: I went thru the RepRap Firmware configuration and did not see this option.

I am currently running a Duet Wifi with an Ethernet Board with Firmware 1.18 to 2.02 RTOS (2018 12-24b1), Web Interface is 1.22.5. I was just doing some research on my E3DV6 hot end and it led me to a video by some guy name Thomas Sanladerer showing how to look at and modify the firmware for a new printer. In this video he stated that something very important was the "heater sanity check" which monitors the heaters and temp probes to look at a possible failure and to shut it down in the event that it thinks it has failed. He used the Audrino software, which I downloaded and could not get it to read the Duet Firmware. My question is.......Does the Firmware 2.02 RTOS (2018 12-24b) perform this sanity check? If not, what does it do to prevent a possible overheating/fire condition?

Any help is greatly appreciated.

I am printing a part right now, it will be done by lunch. After that I may try the S2 command without the M564. I'll try to post my results. Again, right now all is working great. Would still like to learn what does what and so forth.

Thanks everyone for your help.

Originally this machine homed x and y first, however, it was always my opinion that Z should be homed first as we have a home switch. Thus it drops the bed down out of the way. With the new firmware, I was excited to see that I could not home anything until Z was homed.

So now my question is......Should I have used an S2 in all of these files instead of the M564 H0? Should I do both? Or don't worry about it since it works? In trouble shooting I have learned to make only one change at a time. It takes a while longer, but at least I know and understand the effects of each action.

homey.g

;
G91
G1 Z0.5 F400
G1 Y-500 F3000 S1
G1 Y4 F600
G1 Y-10 S1
G1 Z-0.5 F400
G90

homex.g

;
G91
G1 Z0.5 F400
G1 X-500 F3000 S1
G1 X4 F600
G1 X-10 S1
G1 Z-0.5 F400
G90

homez.g

;
G91
G1 Z400 F500 S1
G1 Z-4 F200
G1 Z10 S1
G90

Ok, first off. The M564 H0 WORKED!!!!!! However here are the homing files for review.

Here is homeall.g

M561
G91
G1 Z0.5 F400
; home Z first
G1 Z400 F500 S1
G1 Z-4 F200
G1 Z10 S1

; then home Y
G1 Y-500 F3000 S1
G1 Y4 F600
G1 Y-10 S1

; then home X
G1 X-500 F3000 S1
G1 X4 F600
G1 X-10 S1
G90

I'll try that after the print is done. What I don't understand is that my home routine starts with the z axis, then y, then x. This is the order that individual home routines work. I would have thought that if the homeall.g routing contained that same code it would work.

Thanks for your help. I'll post my results.

I actually tried the M667 S1. This is what I started out with. I read the post where it said to look at the update notes, so I did and that is where I got the M669 K1. I thought this was done on a much earlier update. Any way when using the M667 S1 I did the home x, y, and z work as they should individually, however the homeall.g does not function and the G28 in the gcode file still won't work. I am running a print right now that has the g28 command deleted. It is about a 4 hour print. I am going to try the M564 H0 command in the config.g file when I am done with this print.