Hotend power turns on, stays on.

[TTN-]

Hi :)

Having spent a couple of days trying to get my delta dialed in makes me appreciate this marlin fork a lot.

I've just run into a wee problem: the hotend heater turns on to full power when I run G30 A and stays on, even after I hit the reset button on the reprapdiscount lcd panel. The result was me wondering what that burning smell was while my jhead goes over the max temp and starts to cook its PEEK holder and PTFE liner.

Is anyone else experiencing this?