<p>The first value, which is in your pictures 179 and 184&nbsp;°C, is the measured value. The 0&nbsp;°C value is the set value. It looks like the temperature reading from the hotbed is not working correctly. So there are two possible issues:</p>

<ul>
<li>The cable on the backside leading to the hotplate might be damaged. This seems to be a common issue with this printer. You could check if the cables show any obvious damage.</li>
<li>The hotbed thermistor is broken. On the leads on the backside you can measure with a multimeter the resistance between the green an blue cables. Typical readings are in the range of 100&nbsp;k&ohm;. If you touch the thermistor, usually it is placed in the mid area of the heatbed, the resistance should change.</li>
</ul>

CC BY-SA 4.0
2020-04-10T05:12:51.047Z
Sorry for the super late comment but I suspect that the hotbed thermistor is broken, do you know if this thermistor is easily commercially available to buy and if so the compatible types? Thanks!
Bryan
CC BY-SA 4.0
2020-01-20T00:24:41.673Z
2020-01-20T05:49:24.047Z
2020-01-20T05:49:24.047Z
Fototux
<p>It's been about a month since I've started using my Anycubic i3 Mega and everything has been going great. But today, I left it alone to print a 3DBenchy and it suddenly stopped mid-print. I didn't see it stop but once I came to the printer, the motors and the bed were at ambient temperature suggesting that it has stopped for quite a while. I was surprised that the Bed Temperature registered at over 200&nbsp;ºC (although it wasn't at all hot) and tried to stop the print. However. I wasn't able to stop the print (It said stop failed) and I couldn't change the temperature, so I just switched the PSU off. </p>

<p>After leaving it for a few minutes, I turned the printer back on and the Bed Temperature still registered at absurd temperatures although it wasn't hot at all as seen on the Image Below.
<a href="https://i.sstatic.net/EncSu.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/EncSu.jpg" alt="Image 1"></a></p>

<p>I then tested the Hot End as the temperature seemed normal and it does seem to work and I was able to get some filament to be extruded out normally.
<a href="https://i.sstatic.net/lpFEm.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/lpFEm.jpg" alt="Image 2"></a></p>

<p>Any ideas on what happened here? It was working fine for an entire month and was working fine for the day, but mid-print it just suddenly broke. I've also <a href="https://i.sstatic.net/ZpE7Q.jpg" rel="nofollow noreferrer">uploaded a GIF to Imgur</a> to show how the bed temp fluctuates a lot. Any help would be appreciated :)</p>

CC BY-SA 4.0
2020-01-20T06:32:25.313Z
I think that this question is pretty similar to ["Ender 3 displaying wrong temperatures for hotend and bed"](/q/11470), the OP fixed it by replacing the thermistor.
0scar
<heated-bed><troubleshooting><anycubic-i3-mega>
Anycubic i3 Mega incorrect Heated Bed temperature Reading
Bryan
# Anycubic i3 Mega incorrect Heated Bed temperature Reading

(Asked by: username_0 on 2020-01-19)

It's been about a month since I've started using my Anycubic i3 Mega and everything has been going great. But today, I left it alone to print a 3DBenchy and it suddenly stopped mid-print. I didn't see it stop but once I came to the printer, the motors and the bed were at ambient temperature suggesting that it has stopped for quite a while. I was surprised that the Bed Temperature registered at over 200 ºC (although it wasn't at all hot) and tried to stop the print. However. I wasn't able to stop the print (It said stop failed) and I couldn't change the temperature, so I just switched the PSU off.

After leaving it for a few minutes, I turned the printer back on and the Bed Temperature still registered at absurd temperatures although it wasn't hot at all as seen on the Image Below.
[![Image 1](https://i.sstatic.net/EncSu.jpg)](https://i.sstatic.net/EncSu.jpg)

I then tested the Hot End as the temperature seemed normal and it does seem to work and I was able to get some filament to be extruded out normally.
[![Image 2](https://i.sstatic.net/lpFEm.jpg)](https://i.sstatic.net/lpFEm.jpg)

Any ideas on what happened here? It was working fine for an entire month and was working fine for the day, but mid-print it just suddenly broke. I've also [uploaded a GIF to Imgur](https://i.sstatic.net/ZpE7Q.jpg) to show how the bed temp fluctuates a lot. Any help would be appreciated :)

**Tags:** heated-bed, troubleshooting, anycubic-i3-mega

> **Comments:**
> **username_1**: I think that this question is pretty similar to ["Ender 3 displaying wrong temperatures for hotend and bed"](/q/11470), the OP fixed it by replacing the thermistor.  

---

## 1 answers

### Answer by username_2 on 2020-01-20. Score: 1

The first value, which is in your pictures 179 and 184 °C, is the measured value. The 0 °C value is the set value. It looks like the temperature reading from the hotbed is not working correctly. So there are two possible issues:

* The cable on the backside leading to the hotplate might be damaged. This seems to be a common issue with this printer. You could check if the cables show any obvious damage.
* The hotbed thermistor is broken. On the leads on the backside you can measure with a multimeter the resistance between the green an blue cables. Typical readings are in the range of 100 k&ohm;. If you touch the thermistor, usually it is placed in the mid area of the heatbed, the resistance should change.

> **Comments:**
> **username_0**: Sorry for the super late comment but I suspect that the hotbed thermistor is broken, do you know if this thermistor is easily commercially available to buy and if so the compatible types? Thanks!  

---

