Turn the printer off and then on.
Preheat the heated bed and extruder for PLA temperature through the Preheat menu of your printer.
Unplug the heated bed thermistor wires:
Rambo Mini heated bed thermistor connector (MK2, MK2S, MK2.5 and MK2.5S).
Rambo Einsy heated bed thermistor connector (MK3 and MK3S).
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