selftest error heated/thermistor not connected
 
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norma elva.c
(@norma-elva-c)
New Member
selftest error heated/thermistor not connected

I just finish building the Original Prusa i3 MK2S, when I do the selftest, everything passes, except the bed doesn't heat :(, I check the connections and everything is according to manual, is there anyway to debug it? I have a multi-meter. What should I do?

Posted : 09/01/2018 6:18 pm
norma elva.c
(@norma-elva-c)
New Member
Topic starter answered:
Re: selftest error heated/thermistor not connected

I did some more debugging, and I found two sources that seam helpful,
This one which explains that the 15A fuse, should have 0.8 Ohm for resistance, which it has,
https://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/heated-bed-dead--t6728.html#p46890

and this one which helps trouble shooting the printer:

https://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/-before-you-ask-troubleshooting-video-updated--t472.html#p39190

Here I noticed that my temperature display 23 c for both, Josef mentions that it should be around 30 c, is 23 around 30 c?
How do I know if the thermistor cable is broken, if I am not able to access the other end because of the yellow tape?

Posted : 09/01/2018 8:02 pm
Robert Eliason
(@robert-eliason)
New Member
Re: selftest error heated/thermistor not connected

Hi!

I've had some issues with the bed thermistors where the cables developed faults.
Since you have a multimeter available you can try this procedure: http://help.prusa3d.com/l/en/article/0t79v2VTk2-heatbed-not-heating-up-properly

If your thermistor is faulty you should contact the support and let them know what you found. Take pictures/video 🙂

Good luck!
/Robert

Posted : 24/01/2018 4:57 pm
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