I need some help troubleshooting my thermistor readings. I am consistently getting a reading of over 475. I'm using marlin firmware 1.1.0 and have tried swapping thermistor which doesn't make any difference. Is there a setting in config.h that I need to modify?

Lol. I got it folks. Had the wrong sensor defined....kicking myself.

It is maybe wrong sensor value on marlin.ini
Check your sensor on the heatbed its must be bonded heatbed