The printer is showing the message "Check the heatbed heater & thermistor wiring for possible damage."
Error name: Bed preheat error
Error code: #13201 (MK4) #21201 (MK3.9)
This message is shown when, during the preheat, the printer does not increase more than 2 ºC for 20 seconds. The heating is paused so the issue can be fixed.
Make sure that the ambient temperature where the printer is is stable, and above 10 ºC.
This error can be caused by damage to either the heatbed thermistor or the heatbed power cable.
On the heatbed, check the following:
In case all the items are correct, there might be an internal break in one of the cables. If you do not have a multimeter, it is possible to check the cables using the following test:
In case you have a multimeter available, it is possible to check the resistance of the cables using the Multimeter usage guide.