Rostock Max V2 goes to DEF DEF when bed is above 90C

[TFMike]

I normally print around 70-80C bed temperature, but without an enclosure, printing with ABS needs a bit hotter bed temp. So I had been experimenting the last few days with temps at and above 100C, but I noticed something extremeley strange - halfway through the print the lcd screen will read DEF for both the hotend and the bed. Its not the hotend because when I flip the on/off switch quickly the temp readings return.

So the only thing I can think of is that I made an error when I installed the thermistor and heating resistor to the heated bed, but what could it be and how do I fix it/troubleshoot it?


Any help is appreciated, thanks.

[geneb]

"def" shows up when one or both of the thermistors are bad or disconnected. When the "def" (defective) label appears, does it do it at the same nozzle height?

g.

[TFMike]

I dunno, thats a good question actually. I have tightened the the conenction on the hotend thermistor and I can try to print something else and see if it happens again. Why would it short out at a certain height though and not another?

[geneb]

Might be a break in the wire that only separates when the wire is at a certain bend angle.

g.

[Eaglezsoar]

I normally print around 70-80C bed temperature, but without an enclosure, printing with ABS needs a bit hotter bed temp. So I had been experimenting the last few days with temps at and above 100C, but I noticed something extremeley strange - halfway through the print the lcd screen will read DEF for both the hotend and the bed. Its not the hotend because when I flip the on/off switch quickly the temp readings return.

So the only thing I can think of is that I made an error when I installed the thermistor and heating resistor to the heated bed, but what could it be and how do I fix it/troubleshoot it?


Any help is appreciated, thanks.

Have you found and fixed the problem?