300℃ thermistor shows -19deg

[John Soler]

I have new 300℃ thermistor that i bought in February. I installed it a few days ago, and it shows -19deg at room temperature. When I heat the hotend the temperature rises. If I set the hotend to 200℃ it show 200℃ on the display, but reads with an infrared reads about 130℃.
When I test the resistance if the thermistor it shows 4.20M ohms. When I test different 100K ohm resistors they read 106k ohms.

This is being run by Marlin 2.1.2.4, on a Bigtreetech SKR V1.4 (Turbo).
This is not letting me print.
Any help on this would be great.

Also what size thread and pitch is the Dyze thermistor?

[ezequiel luna]

It's not Marlyn's problem! It's a problem of thermistor failure! The 300-degree thermistor should measure 100k omns. I also had problems with the 300-degree thermistor. It arrived defective like the one that came to you. Dize design I think I would have to do quality control on the thermistors before sending them! After that nothing to say about the products of dize design

[yves R.]

you probably received a 500c thermistor.

check the thermistor table chart here.

https://docs.dyzedesign.com/general-support/temperature-sensors.html#_500%C2%B0c-thermistor

20 celcius   resistance 5200K

25 celcius  resistance 4500K

https://docs.dyzedesign.com/hotends.html#marlin-firmware

Yves

[John Soler]

That was the issue (one of the issues ).