¶ 1. Problem description
The screen displays "Error, key: 2564, extruder not heating as expected.".
¶ 2. Reason analysis
(1) The thermistor terminal wire is not plugged in when the nozzle is heated.
(2) The ceramic heating block/thermistor wire of the nozzle is loose or not tightly inserted.
(3) Broken or cracked solder joints on the wires of the ceramic heating ring at the hot end.
(4) The heated nozzle is loose.
¶ 3. Troubleshooting and solution
(1) Open the nozzle cover, and then check whether the nozzle heating wire and thermal terminal block on the nozzle board are inserted in place, and also check whether the terminal is inserted in place.
(2) Remove the nozzle insulation sleeve and check for any other abnormal conditions such as cracks on the ceramic heating ring.
(3) When heated, check if the nozzle is loose.
(4) If the warranty period has expired, please replace the sprinkle head kit (hotend kit).
The serrated shape can only be solved by replacing the hot end.