MINTEMP triggered on both, bed and nozzle

Hi! In the middle of a couple hour print, MINTEMP got triggered on my prusa with RAMPS/marlin.

The problem is, it does not seem to be thermistor related since both thermistors tell me they are at 0 degrees C and it does not seem to be wire related since bed and nozzle
use different wires. strange, right? turning on and of as well as rewiring does not help, still mintemp triggers... yesterday I got a couple of maxtemps but fixed it with better wiring...

Any ideas?

Ah, and would it be possible to resume a SD card print in such a case?

If the thermistors have reasonable resistance, and the wiring is fine, then it could be something in the ADC converter on the chip.

Are you certain the board is supplying the +V to the pullup resistor for the thermistor? I'd measure the voltage across the thermistor and confirm that one end is at 0V and the other is being pulled up towards +V. If that is true, then your wires are probably good and it is inside the chip that isn't reading the pulled up voltage properly.