Error MINITEMP K-8400

Switched on the machine, Err: MINITEMP on straight away. I was printing last night, everything was OK. Now this. WHY?? How to reset the error???

Check the connections of your thermistor on the printhead.

Checked, they absolutely fine. I was printing day before. Everything was fine. Error still on…

I give up. Checked all the connections+Main board, Large plug on print head. All looks fine. I dont know whats wrong. Faulty thermistor?? Mintemp still on…

Check the connections with a multimeter and also, I hope you do not have the firmware for 2 heads on a printer with one head as this is explained in the manual how to change the firmware.