Turn the printer off.
Locate the hotend heater connector on your controller board:
Rambo Mini hotend heater connector (MK2, MK2S, MK2.5 and MK2.5S).
Rambo Einsy hotend heater connector (MK3 and MK3S).
Unplug the hotend heater from the Rambo board.
Turn the printer on.
Preheat the heated bed and extruder for PLA temperature through the Preheat menu of your printer.
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