Hotend Problem

Hello guys

I built a Mendel using Sanguino electronics. I ran my first test print, and everything appear to work fine with one exception. My J-head hotend heats to the desire temperture of 185 degrees, the machine starts printing, but something shut off the temperature to the hot end. I have been working on finding the source of the problem everyday for a week. Any suggestions?

Could be hardware or software..

If you just manually turn on the hot end and leave it does it stay on? (if no, its a hardware problem, probably broken wire, or bad fet)

If it was fine make the printer move around back and forth on the X axis does it stay warm? (if no its probably a broken wire or bad plug and movement makes it disconnect)

Still ok, next check your gcode file for anything setting the temp to something lower or off.