Error:: Extruder switched off. MINTEMP triggered !
Error:Emergency Stop Called! Check temperature sensors
This is caused by a break in the temperature sensor circuit. A break happens if any of the following happen:
-Your hot end isn't connected or has a broken thermistor.
-Your purple temperature sensor cable is loose from the RAMPS.
-There's a break in your wire harness of your purple temperature sensor cable.
You can test the continuity of your thermistor with a multimeter. Type A Machines Groovemount Hot Ends come with 100K thermistors.
If you've ensured that your hot end is in working order, you can test the continuity of the temperature sensor on your wire harness.
Try connecting while the toolhead is in various positions of the machine. You can move the toolhead around by hand. In a situation where you connect and don't see the error. Move the toolhead around while the machine is connected. If the error manifests while you are moving the toolhead, than your purple temperature sensor cable will need to be replaced.