1

The heated bed on my prusa i3 will work if I tell it to preheat from the controller (lcd 12864) but wont if I;

send it a g-code from the computer,

change the heat temperature using the controller while it is printing from computer

tell it to heat from either printrun or repetier.

Thermistor is giving correct value. Im a 3d printing newb so Im hoping its something simple that all the experts here will laugh at.

2

What firmware and hardware are you using?

3

Thanks for rep[lying.

Im using Prusai3, RAMPS 1.4, Arduino Mega 2560, and Reprap discount full graphic controller.