1. The heat sensitivity of the hot bed and the heat sensitivity of the nozzle should be adjusted to determine whether there is a heat sensitivity problem. If so, it can be replaced.

2. Please contact the manufacturer for mainboard problem.

The maximum temperature alarm is generally caused by the thermal short circuit. You can check the thermal circuit problem, and you can check whether the original abnormal display is normal. If it is normal, then the thermal is broken.

The minimum temperature alarm is that the heat sensitive line is open or the line is inserted falsely. If the heat sensitive line is open, it can be tested whether it is a heat sensitive problem by swapping with the heat sensitive of the hot bed. If it is, it needs to be replaced with a new heat sensitive one to solve the problem; It is also possible that the circuit is loose, so it is not touched. Plug in the thermistor wire at the motherboard again, and check whether the temperature display is normal after starting up;

If the temperature display is abnormal after replacing the new thermal sensor, it may be a problem with the main board. If there is a problem with the main board, it is recommended to return to the factory for repair, which is more convenient for detection and mainboard maintenance.