It may be caused by the loose wiring of the hot bed.Please re plug it.
When heating is not clicked, the hot bed temperature displayed by the printer shouldbe similar to the room temperature. If the temperature is abnormal, the thermistor of the hot bed may be damaged.
① Click to heat the hot bed to 60 ℃, and open the bottom cover plate. Observe whether there are two yellow lights on the motherboard during heating（picture1).If not, it is the mainboard malfunction.
② During heating, measure whether the input voltage of the main board power port is 24V（picture2). If not, it indicates that it is a power failure. Then measure whether the output voltage of the hot bed port is 24V. If not, it is the mainboard malfunction.（picture3)
If the above methods are invalid, we suggest you create an after-sales ticket and our After-sales engineers will help you solve the problem. (Reply time :1 working day)
Please click this link to submit your ticket: