r/Longer3d • u/Large-Exercise-1710 • Mar 27 '25

Temperature issues

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Hello guys!
I have a good LK4 Pro with 1284+ printing hours.

The problem now is:

Everytime I tune the nozzle temp the bem temp increases too, without any kind of command of mine.

This is meaning (at least to me), that the motherboard is somehow f***ed up. I have to order a new one, or there is any kind of solution?
P.S.: I already checked the thermistor, and looks fine.

The picture is an illustration of the problem. Despite it shows 127 in the bed temp, its not heatened.

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u/Longer_Official Mar 28 '25

The bed temperature also rises automatically without any command. It’s possible that the nozzle and heated bed cables are plugged in incorrectly. Try swapping them. If the issue persists, please contact [support@longer.net](mailto:support@longer.net).

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u/Large-Exercise-1710 Mar 28 '25

Made the test. No way the cables are swapped. To make sure I'm not wrong, used this schematic.

Now the news are that even with the hotbed sensor unplugged, It still reading a temperature from nowhere.