Thank you Labern for the information. Then I think the machine can handle the sensor and the heater error. What about the motor? If the motor is blocked, it will run until burned out, right? Since I hit this issue previously, I printed 3 models, but 1 fall down from the bed to the bottom. When the printing is finished, the machine try to make the bed touch the z-stop, but the bed is blocked by the model. Fortunately, I heard that the motor is blocked and turn off the machine.