Thermistor changed but still indicates -17º

Hi, I have a CR-10 V3, the thermistor is broken, I have changed it, but it still indicates -17º, if I try to heat the extruder a message pops up indicating that I have to reset, the only way I see to reset is to turn off, I have tried another thermistor and it indicates the same -17º, does anyone have any idea how to fix it? thanks.

Message on printer:
Err: MINTEMP
PRINTER HALTED
Please reset