Help Needed with "Key:2340 Unknown Exception" on Ender 3 V3 KE

[fstarck]

Hi everyone,

I recently purchased an Ender 3 V3 KE and started experiencing a strange issue during prints.

I began the day printing some calibration files using Orca Slicer, and everything worked perfectly. However, when I tried printing a model downloaded from Printables.com, the printer displayed the message “Key:2340 Unknown Exception” and stopped during the first layer.

At first, I thought the problem was with the file, so I tried a different model, but the same error occurred. Out of curiosity, I went back to print the calibration files that had worked earlier, and this time I also received the same error.

Here’s what I’ve tried so far to fix the issue:

1. Turned off the printer for a few hours.
2. Updated the firmware to the latest version.
3. Restored the printer to factory settings.

Unfortunately, the problem persists, and now I can’t complete any prints as the error Key:2340 keeps appearing.

Has anyone encountered something similar or knows how to resolve it?

I appreciate any advice or suggestions!

[Bonfireman]

Not sure but this might be something to do with temperature on the hotend. Could be thermistor or even a broken heater. Check connections to the hotend, check the ribbon connection to the hotend.

[fstarck]

@Bonfireman, it wasn’t exactly a problem with the sensors, but your suggestion was on the right track!
I discovered that, accidentally (or mysteriously), the first layer temperature was set to 215°C, while the subsequent layers were set to 1500°C. When the printer tried to increase the temperature to 1500°C after the first layer, the system threw an error.

Thanks to your help, I was able to pinpoint the issue and resolve it.
Thank you so much for your support!

Problem solved!

[Bonfireman]

Think I read on reddit that someone had also set their temperature out of range. Glad you got it sorted.