Extruder and bed heaters turn off shortly after printing starts
Manually I have had the extruder and heater both on up to temperature 140 and 55 respectively. But when printing either from warm condition after starting print or starting from cold and waiting after printing begins the extruder and heater are turned off. The message that they were turned off because the temperature dropped happens about 13 seconds after the temperature dropped on the extruder. That tells me why it would have turned them off but obviously not what turned them off before the temperature started to drop. How do I go about troubleshooting what causes the temperature drop on the extruder that then causes the message that comes too late?
Comments
19:53:43.785 : DebugLevel:14
19:53:43.797 : Error:One heater seems decoupled from thermistor - disabling all for safety!
19:53:43.798 : Error:Temp. raised to slow. Rise = -12.58 after 13079 ms
19:53:43.802 : Disabling all heaters due to detected sensor defect.
19:53:43.805 : DebugLevel:14
If I manually set the temperature it is stable and stays there for a long time
As soon as I start to print after coming up to temperature or having had the temperature stable and started to print, the heater gets turned off somehow and I get the message above about 13 seconds later according to the Temperature Curve and the time line and the log message
I have attached an image for the case where it came up to temperature but the same thing happens if it were at temperature a long time (lets say 10 minutes or more).
I also tried moving the extruder with the manual controls while it was at temperature and did not see this problem.
I know the detection code is not causing the problem, only detecting it after the case.
I would appreciate any suggestions.