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The thermistors do not have a polarity, but you must connect them to the right place.

The hotend thermistor connects to TEMP_1

The bed thermistor connects to TEMP_0

The Ender 3 thermistor connections are too short to reach the placement of the TEMP connectors on the Mini 5+ so they will need to be extended.

Re-crimping them with the proper locking connector will help ensure they are not easily pulled free. In my case I've used a male Dupont pin to connect the extension and will add a blob of hot glue to hold it in place. Adding a piece of wire with solder is another option.

Further information on thermistors can be found here on the wiki. Connecting thermistors or PT1000 temperature sensors

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