E3: Abnormal Temperature Error

The "Abnormal temperature" error indicates that the extruder sensor can not be read. Please check that the nozzle is correctly installed. Use your fingers or a pair of pliers to try to push the extruder further up into the housing until you hear a click. The black clips should be flush with the edge of the extruder assembly.

Then, turn the printer off and back on again.

Refer to our Replacing Your E3 Nozzle article for more information.