How to replace thermistor on Ender 3 S1 Series Sprite Hotend

Is your Ender 3 S1, S1 Pro, or S1 Plus reporting fluctuating temperatures, thermal runaway errors, or showing a "PRINTER HALTED" message due to a heating fault? These symptoms often point to a failing or failed thermistor—the small sensor responsible for measuring your hotend's temperature . Replacing it in the integrated Sprite extruder is a delicate but manageable repair. This guide walks you through the process, from safely disassembling the toolhead to accessing the sensor, installing the correct replacement (NTC 100KΩ B3950) for your specific model (standard 260°C or Pro 300°C version), and ensuring the new sensor is correctly seated with thermal paste for accurate readings . Note: Later models of the Ender 3 S1 series have a different thermistor interface; please verify your printer's version before purchasing a replacement or you may need replace sprite toolhead PCB to older version.

TABLE OF CONTENTS

• Install Video:
• Spare Parts:

Install Video: 

Note: Some unit may have some hot glue from the factory, you can dab some ISO alcohol to loosen it, to prevent damage to the connector. 

Spare Parts:

Ender 3 S1 Pro Thermistor Module

Ender 3 S1 (non high temp) Module