I have a v0.1 reprap pcb heat bed, and melzi 2.0 electronics. I've unplugged everything except for the bed for testing (everything else works.) Temperature is being properly detected, but when I use pronterface to send a command to heat the bed, the target temp will go up to wherever it's supposed to be, stay there at most a few seconds, and then drop right back down to 0. I have two ideas, one that my ground connection is bad in which case i'd have to solder it because my crimp housing broke (i'm hoping it's this.) And my other idea is that there's some firmware problem in which case I know very little about firmware. Is it possible that a bad ground could lead to a spike in the target temp? (sorry this post doesn't have any pictures and has little detail, I'm posting this at 2 am.)
better picture of the ground, before i soldered it
I didn't have access to any crimpers or crimp housings, so i soldered the pins. i took care to leave them isolated of each other. there is no overlap of solder and in the near future i plan to protect them with hst
I hope this is enough information. If you need more just ask. Thanks.