Hello all,
I'm receiving the same error message "temperature reading fault on heater 1: open circuit". I replaced the fuse with a .25 amp fast acting fuse and 5 x 20 fuse holder, but that didn't work either. I made sure to solder the fuse to the same spot user "cap" did in this thread: https://www.duet3d.com/forum/thread.php?id=247. This is on my new kossel XL with the duet wifi. Everything was working fine until i replaced one of my fans on my hotend. I accidentally had it wired wrong and it burnt out the fan. Though the hot end was still heating up fine. It wasn't until i got the new fan, replaced it, that i started to get the above error message. When i checked my hotend for a short i indeed saw that the back of my z sensor board was touching the hotend. Fixing that and the fuse i assumed would be the end of it but the message remains. Even after resetting the hotend in the duet web control with command M562 P1.
thoughts?