We have an M200 extruder that no longer heats, there 24v on both the pins to the heating element from the back of the PCB when taking to ground. there is no change in voltage regardless of setting in menu. Is this likely to be PCB or Motherboard fault? - Resistance on heating element is slightly low (14.7Ohm, 2.3Ohm on thermocoupler) there is continuity of the heating element.
you can disassemble the heater and give a direct 24V to its cable to see if it warms up
even a 12V is enought to warm it up.
if I remember well, with 12V it reaches near 180 degrees