Every print stops: MINTEMP triggered, system stopped!

What is the problem?

Just have new installed the latest version of Octoprint and in a sudden every print stops with the following error message: MINTEMP triggered, system stopped!
With previous Octoprint versions and also from SD card the printer just works fine!

What did you already try to solve it?

Printing from SD - is fine!

Have you tried running in safe mode?

No

This is not an error OctoPrint itself will cause, it is an error coming directly from the printer firmware. You've elected to omit the rest of the template that was here when you wrote the post, providing extra details about your setup, what printer you actually have and a systeminfo bundle as well, so there is not much to say.

I almost assume it is a Creality printer and with/without SD card in the printer's SD card slot will fix it...

It's a Anycubic Mega S, Systeminfo bundle attached. Sorry for the newbie behave ,,,
octoprint-systeminfo-20221014143537.zip (20.2 KB)

It seems the heated bed does not reach the desired temperature of 60Β°C

2022-10-13 16:29:31,289 - octoprint.util.comm - WARNING - Received an error from the printer's firmware: MINTEMP triggered, system stopped! Heater_ID: bed - Printer halted. kill() called!
| Last lines in terminal:
| Recv:  T:209.6 /210.0 B:40.6 /60.0 @:48 B@:127 W:?
| Recv:  T:209.6 /210.0 B:41.3 /60.0 @:50 B@:127 W:?
| Recv:  T:209.6 /210.0 B:40.6 /60.0 @:49 B@:127 W:?
| Recv:  T:209.5 /210.0 B:41.0 /60.0 @:50 B@:127 W:?
| Recv:  T:209.6 /210.0 B:41.0 /60.0 @:48 B@:127 W:?
| Recv:  T:209.8 /210.0 B:40.3 /60.0 @:46 B@:127 W:?
| Recv:  T:209.9 /210.0 B:40.8 /60.0 @:45 B@:127 W:?
| Recv:  T:210.0 /210.0 B:40.1 /60.0 @:43 B@:127 W:?
| Recv:  T:210.0 /210.0 B:39.8 /60.0 @:43 B@:127 W:?
| Recv:  T:210.0 /210.0 B:39.0 /60.0 @:43 B@:127 W:?
| Recv:  T:210.0 /210.0 B:40.1 /60.0 @:44 B@:127 W:?
| Recv:  T:210.0 /210.0 B:40.7 /60.0 @:44 B@:127 W:?
| Recv:  T:210.0 /210.0 B:39.8 /60.0 @:44 B@:127 W:?
| Recv:  T:210.1 /210.0 B:40.0 /60.0 @:42 B@:127 W:?
| Recv:  T:210.2 /210.0 B:40.2 /60.0 @:41 B@:127 W:?
| Recv:  T:210.2 /210.0 B:39.8 /60.0 @:42 B@:127 W:?
| Recv:  T:210.3 /210.0 B:41.7 /60.0 @:40 B@:127 W:?
| Recv:  T:210.3 /210.0 B:39.5 /60.0 @:40 B@:127 W:?
| Recv: Error:MINTEMP triggered, system stopped! Heater_ID: bed
| Recv: Error:Printer halted. kill() called!

Either there is a broken fuse for the bed, a lose heater cable, a detached thermistor, a lose thermistor cable.

You may check the hardware.

I've checked the hardware and couldn't find anything wrong - also the printer flawless when I print from the SD card! Also before an update to the latest Octoprint version everything worked just fine!

Anyhow, something is turning off the heated bed. And it's not OctoPrint.

Please try safe mode.

There's definitely something wrong with the printer's hardware or firmware as far as it looks when it is connected to OctoPrint. The bed temperature is very variable (as it is reporting, I doubt the measurements are accurate). Aside from the section already shown,

At 16:35, the temperature is reporting as ~12 degrees:

| Recv:  T:53.1 /0.0 B:12.5 /60.0 @:0 B@:0 W:?
| Recv:  T:53.0 /0.0 B:12.6 /60.0 @:0 B@:0 W:?
| Recv:  T:53.0 /0.0 B:12.5 /60.0 @:0 B@:0 W:?
| Recv:  T:52.9 /0.0 B:12.4 /60.0 @:0 B@:0 W:?
| Recv:  T:52.7 /0.0 B:12.5 /60.0 @:0 B@:0 W:?
| Recv:  T:52.7 /0.0 B:12.4 /60.0 @:0 B@:0 W:?
| Recv: Error:MINTEMP triggered, system stopped! Heater_ID: bed

Then a minute later at 16:36 when you reconnected it was reporting only ~5 degrees:

| Recv: ok T:46.1 /0.0 B:5.8 /0.0 @:0 B@:0
| Send: M140 S60
| Recv: ok
| Send: M105
| Recv: ok T:45.7 /0.0 B:5.6 /60.0 @:0 B@:0
| Recv: Error:MINTEMP triggered, system stopped! Heater_ID: bed

This one is worse, at 16:43, the temperature dropped by over 10 degrees between reports, which should be intervals of 2 seconds (usually):

| Recv: ok T:215.4 /215.0 B:59.7 /60.0 @:41 B@:127
[...]
| Recv: ok T:215.2 /215.0 B:48.3 /60.0 @:43 B@:127
[...]
| Recv: Error:MINTEMP triggered, system stopped! Heater_ID: bed

And again on the next connection, a huge swing:

| Recv: ok T:216.7 /215.0 B:42.0 /60.0 @:23 B@:0
[...]
| Recv: ok T:214.7 /215.0 B:60.2 /60.0 @:50 B@:0
[...]
| Recv: Error:MINTEMP triggered, system stopped! Heater_ID: bed

Usually, this looks like a thermistor loose connection or short. If the temperature reporting is perfectly stable when the printer is printing from the SD card, then perhaps having the USB cable connected to the printer is introducing an electrical fault somewhere, or some interference on the line. Make sure that when you are printing from OctoPrint, you also leave the SD card in the printer as we have seen this cause bugs with other printers (Creality) in the past.

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