temp problem

[tbcab]

HI im having a problem with my ME DUCER printer the temp always says 270 so i thought i would order a new temp prob but that did not help.
If i put heat past 270 then it will start to work. so i thought it may be coming from the board so i swapped the bed and head temp and its till doing this so i know now that its coming from the board even if i unplug that port is says 270. is there a was to calibrate the board back to 0

[Mark]

I think you can refer to this link to check the thermistor and the board, it is for the GT2560 but they are similiar, or maybe reinstall the firmware to see if it works.
http://www.geeetech.com/forum/viewtopic ... 13&t=17030