guess what? theres another problem.
when i tell the bed to preheat to 75˚ it blows past and just keeps heating until it reaches 90˚ at which point I unplugged it. Some people have had similar problems except their beds immediately do this when the printer is turned on. Mine only starts when I tell it to.
im going to make a new thread for this, see http://3dprintboard.com/showthread.p...6266#post76266