The nozzle of the 3D printer doesn't heat up may have following reasons.
If the nozzle of the 3D printer is cleaned but without heating up.
The method is as follows: 1. Manually adjust the nozzle temperature to 240 ℃, remove the front fan, and after the temperature is reached, manually squeeze the rubber wire into the feed throat to make the nozzle normal Out of the wire. Then pull out the glue thread, enter the feed throat again, wait for the glue thread to melt, then pull out the glue thread, so that the semi-melted glue thread will carry the residue in the nozzle. Repeat the operation several times. 2. Use 0.3mm steel wire to dredge the nozzle. Then repeat the above method
If it is not about reasons, then check the following steps,
1. Check whether the crimping sleeve between the heating rod, the lead of the heating resistor and the extension wire is in poor contact.
2. Is the fan port facing the print head of the print module?