Extruder Termperature Reading -423!
Hi, my extruder temperature reading is -423. The BoXYZ interface always logs "Laser Head Detected" regardless of which quick change tool head is connected. Not sure if this log message is new, but I just noticed it when troubleshooting. I have searched the Answers for troubleshooting tips. I checked the wiring of the thermistor, the quick change coupler, and the connections on the main board (see photos). I checked the EEPROM settings and confirmed that PID drive min was set to 70.
Because this temperature reading is the same, regardless of which quick change tool head is connected, and even if the quick change cable is disconnected, I assume the problem is not in the 3D printhead. But I cannot explain a temperature reading of -423; according the posts in the Answers the minimum can be -26 which reflects infinite resistance. Also, the laser head should read a temp of 989. So why is the interface detecting a laser head while displaying a temperature of -423? Mainboard or Arduino issues?
The machine responds well to manual commands: XYZ translations and filament extrusion. I can do an air pass with gcode files for the CNC tool head. But the temperature reading does not change when I turn the temperature on in the interface. Also, when I try to 3D print, BoXYZ just waits and the hot end does not get any warmer to touch.
Just came across this issue last night when I wanted to run test prints with new filament. I haven't 3D printed in several months, and don't know when this problem might have cropped up. I was hoping to print something this weekend.
Any advice is appreciated.
Is this a good question?