<p>The fact that the temperature reading stays steady while heating and changes once it stops heating makes me thing that you might have a short between your heater wires and sensor wires or somehow have them interconnected. Especially if it shows the same temperature when it's actually below 110°C and heating but shows correct when not heating. I would try to separate the heater wires from the sensor wires and make sure they are not touching, also check that the sensor wires are not touching the heating block.</p>

CC BY-SA 4.0
2018-10-08T22:17:16.120Z
2018-10-08T22:17:16.120Z
JasonT Tech
<p>After doing some repairs and upgrades on my Ultimaker Original, I found my temperature readings to be <em>weird</em>.</p>

<p>The reading is not incorrect, as long as the temperature is above 110°C. When the real temparature is below 110°C, the sensor will always read 110°C, with only subtle changes around 0.1°C.</p>

<p>This will cause the printer to abort heating, because it does not see a change in temparature for the first 30 seconds (when the temperature is below 110°C).</p>

<p><a href="https://i.sstatic.net/vXm5g.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/vXm5g.png" alt="Pronterface Tempearture Readings"></a></p>

<p>Here you can see a screenshot of Pronterface, showing how the temperature (blue line) starts increasing when my printer already aborted heating (violet line).</p>

<p>I am certain that the reading is incorrect because at the beginning the hotend actually feels cold to touch.</p>

<p>I am also certain that the reading above 110°C is more or less accurate.</p>

<ul>
<li>What could this be caused by? What parts should I replace?</li>
<li>If I should replace the TC2, will a TC1 do too? I can't seem to find any store selling the TC2.</li>
<li>If I should replace the sensor, what kind of sensor should I search for?</li>
<li>Or is there a drop-in sensor-chip-combination that I can buy?</li>
</ul>

CC BY-SA 4.0
2018-08-27T14:13:52.697Z
What were your upgrades?
Trish
CC BY-SA 4.0
2018-08-27T19:33:27.913Z
A lot of different ones, new extruder, new heater, new (but same) chip. The temp sensor is still the same though, so I suspect it got damaged during my migration into the new heater block.
Markus Appel
CC BY-SA 4.0
2018-08-28T08:15:57.773Z
At first you should check the temperature sensor. See if the resistance increases in proportion to the temperature. Then it might be a good idea to find the component causing the problem by swapping them with the original one by one.
Klaus D.
CC BY-SA 4.0
2018-08-29T15:14:19.467Z
The temp sensor is original though.
Markus Appel
CC BY-SA 4.0
2018-10-04T10:06:11.527Z
Maybe the temperature sensor isn't making proper contact with the part it's meant to be measuring, until said part has slightly expanded? But a damaged sensor would be my first bet.
Firedrake
CC BY-SA 4.0
2018-10-04T11:40:03.327Z
I meanwhile replaced the temperature sensor with a brand new one, without any change in readings. Would your situation not result in a too cold reading until a certain temperature is reached? Mine is reading wayy to hot until 120°C is reached.
Markus Appel
<hotend><ultimaker-original>
Hotend temperature reading limited
Markus Appel
# Hotend temperature reading limited

(Asked by: username_0 on 2018-08-27)

After doing some repairs and upgrades on my Ultimaker Original, I found my temperature readings to be *weird*.

The reading is not incorrect, as long as the temperature is above 110°C. When the real temparature is below 110°C, the sensor will always read 110°C, with only subtle changes around 0.1°C.

This will cause the printer to abort heating, because it does not see a change in temparature for the first 30 seconds (when the temperature is below 110°C).

[![Pronterface Tempearture Readings](https://i.sstatic.net/vXm5g.png)](https://i.sstatic.net/vXm5g.png)

Here you can see a screenshot of Pronterface, showing how the temperature (blue line) starts increasing when my printer already aborted heating (violet line).

I am certain that the reading is incorrect because at the beginning the hotend actually feels cold to touch.

I am also certain that the reading above 110°C is more or less accurate.

* What could this be caused by? What parts should I replace?
* If I should replace the TC2, will a TC1 do too? I can't seem to find any store selling the TC2.
* If I should replace the sensor, what kind of sensor should I search for?
* Or is there a drop-in sensor-chip-combination that I can buy?

**Tags:** hotend, ultimaker-original
> **Comments:**
> **username_1**: What were your upgrades?  
> **username_0**: A lot of different ones, new extruder, new heater, new (but same) chip. The temp sensor is still the same though, so I suspect it got damaged during my migration into the new heater block.  
> **username_2**: At first you should check the temperature sensor. See if the resistance increases in proportion to the temperature. Then it might be a good idea to find the component causing the problem by swapping them with the original one by one.  
> **username_0**: The temp sensor is original though.  
> **username_3**: Maybe the temperature sensor isn't making proper contact with the part it's meant to be measuring, until said part has slightly expanded? But a damaged sensor would be my first bet.  
> **username_0**: I meanwhile replaced the temperature sensor with a brand new one, without any change in readings. Would your situation not result in a too cold reading until a certain temperature is reached? Mine is reading wayy to hot until 120°C is reached.  

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## 1 answers

### Answer by username_4 on 2018-10-08. Score: 2

The fact that the temperature reading stays steady while heating and changes once it stops heating makes me thing that you might have a short between your heater wires and sensor wires or somehow have them interconnected. Especially if it shows the same temperature when it's actually below 110°C and heating but shows correct when not heating. I would try to separate the heater wires from the sensor wires and make sure they are not touching, also check that the sensor wires are not touching the heating block.


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