Nozzle temperature showing 107 when off

The nozzle temperature is showing 107 when not in use. Have tried 2 new thermistors and till the same. Swapped over the nozzle & bed thermistor at the board and the fault stays with the nozzle so proving the fault is on the board. Is there anyway of getting the firmware to use thermistor 1 instead of therm0

I have tried setting thermistor 1 as enabled and setting thermistor 2 pin but still showing the temp at therm 1