I'm glad to hear that you are liking the new Mattercontrol version. If you have not yet, I would upgrade to the current version which is now our fully released version.
So we have found on some printers that if the heating block is not shielded, the part cooling fans can drop the temps enough to cause a thermal runaway error. So wrapping your block in a silicone sock or an insulating pad will help with this.
I do agree that the printer should stop printing in the event of the error so this is something we should look into but at the very least it stopped heating!
Let us know if you do run into any more issues or suggestions.
@mikelefty There are two ways to do this. One is to push the reset button on the front of the LCD. Another is to reflash the firmware for the MAX v3. The .hex file for the firmware is located at https://github.com/seemecnc/Firmware/.
Did you re-flash the stock firmware? If so, then it's most likely not the programming or firmware.The RAMBo is a circuit board, and components on circuit boards can go bad. If that happened to components that directly affect the LCD pins, then you'd have trouble. You could try replacing the RAMBo board to logically determine if that's the problem. If you do and you still have the same problem, you know the problem is elsewhere. But given the other troubleshooting steps you've tried, that is possible.
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