temperature drops to neg just as i start to print

[spart]

has any one run into this,

just start to print and temperature gets to there levels starts to print and bamm temperature is now in the minis killing the extruded
thought it was wiring but checks out to be ok

do i have something set to low or to high ?

[lordbinky]

I think -20 is what it reads when loses the thermistor temp.

[Polygonhell]

Most likely it's a bad connection that's breaking when the printer starts to move.

[spart]

i think it turned out to be my hot bed was wired backwards seems to be printing now