I have an SV01 (not Plus) and was removing leaked filament that had caked around the extruder. I didn’t realize that the hotend thermistor wires were embedded in the leaked filament and I pulled them off/put off the thermistor along with the caked-on filament. Has anyone got a good image or, better yet, a diagram/drawing that shows how the wires connect to the thermistor?
The thermistor is a pure resistor, polarity doesn’t matter.
It is likely that the actual thermistor element is damaged.
Good news it they are cheep. https://a.co/d/04SqmiXX
Bad news is unless you want to splice wires you have to thread it all the way to the main board. The second time I ruined mine I went the splice route. Worked out fine.