spot on, the yellow thermocouple wasn't in properly! thanks
just another question, on the circuit board, the black spacers dont seem to be long enough as the board flexes as the back touches the base of the machine when tightening the screws and the top spacers for the fan unit also seem short?
Most likely something is wrong with your temperature sensor connection. Check if the red/yellow wires are properly connected on top of the printer head (and not swapped around) and if the 3 cable connector is firmly inserted.
Also, is the blue light on top of the extruder head on?
(The full message is "Extruder switched off. MAXTEMP triggered !", which means it's reading more then 270C or less then 5C on the temperature sensor)
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