Temp Sensor Error--HELP

[micksquisite 0]

All,

I received an Ultimaker 2 Extended a couple of months ago and just recently installed the Olsson block it came with. The temperature sensor in the original block (0.46mm nozzle) was warped out of shape and could not be removed so I installed the spare temperature sensor that came with the printer. Ever since I installed the Olsson block I keep getting ERROR--TEMP SENSOR. It happens randomly for the most part, and Ive checked all of the connections to make sure they were okay. I did notice sometimes when I manually adjust the nozzle temperature to say 210°C, the probe will skyrocket extremely fast then give me the error. I have read solutions to this problem, but none of them seem to work for me. Currently, the printer will not load the main interface--it just keeps popping up with the error. I've tried soft resetting the printer, I did a factory reset whenever I first installed the probe, connections were checked multiple times... I am unsure of what to do from here. Is there possibly something wrong with the printer itself? I read the Cura software can make it not work correctly, but seeing the printer wont even load the main interface, Im assuming this problem stems from a different source. If anyone could help, I would greatly appreciate it.

[gr5 2,176]

Do you have a multimeter?  Measure the resistance of the temp sensor underneath the printer (while disconnected from the board).  it should be around 108 ohms.  Most likely somehow must have gotten damaged.  You can get a new one from fbrc8.com (ultimaker original parts) or from my store at gr5.org/store/ (3rd party parts).  I test every temp sensor at 260C because a while back many of them would open up around 200-240C and then start working again when they cooled.  However your temp sensor sounds more seriously broken.  They don't solder the sensor to the wiring inside because solder melts at these temperatures so instead they are crimped and metals expand at different rates when you heat them and so they can fail.  Most fail very early on like yours.  Once the temp sensor has survived a few prints it should survive for years.

Edited March 21, 2016 by Guest

[gr5 2,176]

PT100 sensor resistance/temperature chart:

Edited March 21, 2016 by Guest

[Torgeir 243]

Hi Mick,

Do you still have the old nozzle block? If you have, -with the wires intact, try to use this one as it should be ok, hopefully.. Well, you can use a 100 ohm resistor to check that the temperature is reading approx. 0 deg. Celsius. You'll need another resistor at 180 ohm for a hot check, when connected to the board it will show approx. 212 deg. Celsius.

This is an easy way of checking your main boards response to a resistance equivalent to our PT100 (platinium sensor).

You have to be very careful when installing the termoistor, do not bend more than once on the wires going into the termistor block.. It is very easy to break, or to make a close break become an intermittent connection as you have.

Those resistor should be very easy to find at your place..

But I'll guess you just order a few of those PT100 as spare, -as they fail now and then.

Good luck.

Regards

Torgeir.