<p>The heaters (and power supply) aren't capable of heating that fast*, so what you've observed seems to be an error in measurement of the temperature, not a sudden increase in temperature. This can be caused by a faulty thermistor, faulty wiring to the thermistor, or something wrong on the controller board where the thermistor connects to the microcontroller.</p>
<p>I would first make sure all the connections are not loose, and in the right places. Swapping a thermistor connector with some other type of connector may be able to cause a problem like this; typically a few different things use the same 2-pin JST type connectors.</p>
<p>If all the connections are right and you already replaced the hotend assembly (which includes a new thermistor, unless you moved the old one), your board is likely damaged.</p>
<p>(*) Note that this still creates a potential heat/fire danger, because any heating that takes place won't be controlled by accurate measurements of the resulting temperature change! So don't operate it like this.</p>

CC BY-SA 4.0
2023-08-22T13:20:50.857Z
2023-08-23T13:43:02.653Z
2023-08-23T13:43:02.653Z
R.. GitHub STOP HELPING ICE
<p>I would like help with the printer. When I wanted to print yesterday, the display wouldn't start, so I restored it and everything worked. Then the motor that pushes the filament didn't want to move, so I cleaned it up a bit. When I wanted to print something, the bed started to heat up, like 120 °C in a few seconds. So, I quickly connected everything and the nozzle showed -15 °C degrees. Then I replaced the whole extruder, and when I turned it on, the temperature was displayed, but it rose within 2 seconds to 250 °C.</p>
<p>The printer is Artillery Genius Pro.</p>
<p>I tried a new cable to the extruder, and also a new firmware, but it didn't help.</p>
<p>I really don't know what to do anymore.</p>

<troubleshooting><heat-management><temperature><thermistor>
My nozzle is heating up even when it shouldnt
Quickteam cz
# My nozzle is heating up even when it shouldnt

(Asked by: username_0 on 2023-08-22)

I would like help with the printer. When I wanted to print yesterday, the display wouldn't start, so I restored it and everything worked. Then the motor that pushes the filament didn't want to move, so I cleaned it up a bit. When I wanted to print something, the bed started to heat up, like 120 °C in a few seconds. So, I quickly connected everything and the nozzle showed -15 °C degrees. Then I replaced the whole extruder, and when I turned it on, the temperature was displayed, but it rose within 2 seconds to 250 °C.

The printer is Artillery Genius Pro.

I tried a new cable to the extruder, and also a new firmware, but it didn't help.

I really don't know what to do anymore.

**Tags:** troubleshooting, heat-management, temperature, thermistor


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## 1 answers

### Answer by username_1 on 2023-08-22. Score: 1

The heaters (and power supply) aren't capable of heating that fast\*, so what you've observed seems to be an error in measurement of the temperature, not a sudden increase in temperature. This can be caused by a faulty thermistor, faulty wiring to the thermistor, or something wrong on the controller board where the thermistor connects to the microcontroller.

I would first make sure all the connections are not loose, and in the right places. Swapping a thermistor connector with some other type of connector may be able to cause a problem like this; typically a few different things use the same 2-pin JST type connectors.

If all the connections are right and you already replaced the hotend assembly (which includes a new thermistor, unless you moved the old one), your board is likely damaged.

(\*) Note that this still creates a potential heat/fire danger, because any heating that takes place won't be controlled by accurate measurements of the resulting temperature change! So don't operate it like this.


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