Remove the thermistor connection from the printer board of the nozzle.Remove the wire connector of the thermistor.

Take a multimeter and connect in the thermistors two leg by putting the multimeter knob into resistance value.

If the thermistor is showing a value of above 60 ohm means, it is working. Else you have to change the thermistor and connect it back in the same way. And go to next step.