M112 Shutdown every print

[CIlas]

Hello there. First post here.
I was using Marlin Ender3-V2-Stock-20220206 firmware and Octoprint 1.7.3 when this happened. It simply stopped to print with this message on the display.

On the Octoprint Dashboard I got this message:
Thermal Malfunction, system stopped! Heater_ID: E0

And I found this option under Octoprint Settings:
Send M112 on disconnect due to errorIf this is checked, OctoPrint will try to send an M112 prior to a disconnect due to a (fatal) error in order to disable heaters and motors.

My question here is:
Is this something about Firmware X Octoprint not doing fine? May I have this M112 option unchecked? Is this some hardware issue?

Any hint, I will appreciate.

[Matt_Tucci]

Ouch M112 is e-stop.It had a temperature issue, weather the thermocouple quit reading temp or the heater circuit opened. It saw a fault and went into e-stop. M112 is a result of a fault. To somehow turn it off wouldn’t work. Check all the connections on the board. They get loose after several uses of heating and cooling.G Codes and M Codes for 3D printing - What's New In The 3D Printer World-Customize 3D-2022

[CRCinAU]

It looks like there may well be a bug in a new feature in Marlin.

I’ve disabled that feature and am currently building new binaries for testing.

Try updating firmware and give it another go…

[Leon_Cole]

Hi, is this corrected in todays build for ender 4.2.7 bltouch? Flashed a bunch of my printers after board upgrades and getting M112 mid print on all of them. Will re flash tonight if new binary is up. Thanks

[CRCinAU]

In theory, this should be fixed in any versions 20220214 and later.

[CIlas]

For anyone facing this issue, here is the solution.
It is related to a new feature to help on fire protection, implemented on the bug releases.

Thermal Malfunction, system stopped! Heater_ID: E0

I just complied the last Marlin firmware (2.0.9.3) and my printer is back to normal.