<p>If you have access to an <a href="https://en.m.wikipedia.org/wiki/Infrared_thermometer" rel="nofollow noreferrer">IR thermometer</a>, it would be interesting to verify what the actual temperature is.  I doubt the hot end actually reaches that temperature, but:</p>

<ul>
<li><strong>if it actually does</strong>, then it could actually be dangerous, as most extruders are designed for temperatures well below 300°C.  The problem would likely be in the firmware in this case.</li>
<li><strong>if it stays cold</strong>, then probably is a problem with the temperature probe or its cables/connectors being broken. Most printers use thermistors as temperature probes, and thermistors let less and less current pass through the higher the temperature is, so: no current would be interpreted as the hot end being "extremely hot" and the firmware would not heat the hot end further.</li>
<li><strong>if it is hot but at another temperature</strong> than the one displayed, then it could either be a problem with the probe over-reading or a firmware bug (e.g.: the temperature is shown in Fahrenheit, or the firmware mis-process the signal from the probe).</li>
</ul>

<p>Either way: thermistors and cables are cheap to replace, while problems with the firmware may be fixed only if you have access to the code.</p>

<p>If you just bought the printer in a physical store, I would simply swap it with another unit, rather than fiddling with it, though.</p>

CC BY-SA 3.0
2018-02-03T20:07:13.567Z
The tempeature is cold, but the cable is connected...
Hola Soy Edu Feliz Navidad
CC BY-SA 3.0
2018-02-03T22:49:31.467Z
@HolaSoyEduFelizNavidad - the cable could be broken inside, the connector could be defective, the thermistor could be broken... A tester can help diagnosing where the circuit is interrupted... but replacing the unit (if it is an option for you) seems the cheapsst surefire option...
mac
CC BY-SA 3.0
2018-02-03T18:43:32.830Z
2018-02-03T18:43:32.830Z
mac
<p>Firstly, I just bought a G2S mini pro <a href="https://www.geeetech.com/wiki/index.php/Geeetech_G2_%26_G2s_pro" rel="nofollow noreferrer">from Geeetech</a> and it is my first 3D printer (therefore I'm 100% newbie in this area).</p>

<p>The first extruder seems to be ok, the temperature varies from 23°C to 201°C and if you touch it you can see that it is hot. However, for the second extruder, the temperature is shown with more than 400°C:</p>

<p><a href="https://i.sstatic.net/aHMZX.jpg" rel="nofollow noreferrer" title="Second extruder at 400°C"><img src="https://i.sstatic.net/aHMZX.jpg" alt="Second extruder at 400°C" title="Second extruder at 400°C"></a></p>

<p>The cables are connected correctly and the firmware is updated. </p>

<p>Do I have to return the printer? Or is there another solution?</p>

<extruder>
Wrong temperature on extruder 2
Hola Soy Edu Feliz Navidad
# Wrong temperature on extruder 2

(Asked by: username_0 on 2018-02-03)

Firstly, I just bought a G2S mini pro [from Geeetech](https://www.geeetech.com/wiki/index.php/Geeetech_G2_%26_G2s_pro) and it is my first 3D printer (therefore I'm 100% newbie in this area).

The first extruder seems to be ok, the temperature varies from 23°C to 201°C and if you touch it you can see that it is hot. However, for the second extruder, the temperature is shown with more than 400°C:

[![Second extruder at 400°C](https://i.sstatic.net/aHMZX.jpg "Second extruder at 400°C")](https://i.sstatic.net/aHMZX.jpg "Second extruder at 400°C")

The cables are connected correctly and the firmware is updated.

Do I have to return the printer? Or is there another solution?

**Tags:** extruder

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## 1 answers

### Answer by username_1 on 2018-02-03. Score: 3 | Accepted answer

If you have access to an [IR thermometer](https://en.m.wikipedia.org/wiki/Infrared_thermometer), it would be interesting to verify what the actual temperature is. I doubt the hot end actually reaches that temperature, but:

* **if it actually does**, then it could actually be dangerous, as most extruders are designed for temperatures well below 300°C. The problem would likely be in the firmware in this case.
* **if it stays cold**, then probably is a problem with the temperature probe or its cables/connectors being broken. Most printers use thermistors as temperature probes, and thermistors let less and less current pass through the higher the temperature is, so: no current would be interpreted as the hot end being "extremely hot" and the firmware would not heat the hot end further.
* **if it is hot but at another temperature** than the one displayed, then it could either be a problem with the probe over-reading or a firmware bug (e.g.: the temperature is shown in Fahrenheit, or the firmware mis-process the signal from the probe).

Either way: thermistors and cables are cheap to replace, while problems with the firmware may be fixed only if you have access to the code.

If you just bought the printer in a physical store, I would simply swap it with another unit, rather than fiddling with it, though.

> **Comments:**
> **username_0**: The tempeature is cold, but the cable is connected...  
> **username_1**: @HolaSoyEduFelizNavidad - the cable could be broken inside, the connector could be defective, the thermistor could be broken... A tester can help diagnosing where the circuit is interrupted... but replacing the unit (if it is an option for you) seems the cheapsst surefire option...  

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