Hotend Temps wildy unstable

Hi

Finally got time to really try and get my Mk2 up and working after many weeks of it failing to do anything other than crash the head in to the bed.

Now while printing the hotend temp goes from the 215c it's set to down to 190c in a second and then can jump to reading over 230c the next second.

Does this suggest the hotend thermistor it came with is faulty?

Wiring has been checked and looks all good except for in the build manuals diagrams the 2 small blue wires are held in with a black screw. On mine they are just in the body of the hotend.

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I can suggest you to make a PID tunning.

Nilabean, on his youtube channel made a quick video to explain exactly how to do it with Pronterface

Please follow this link : https://youtu.be/CJtARpxLlj8

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Joe Powell will be eternally grateful.