Hotend temperature reading limited 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).



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?
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.