The DM320 is a mid-range controller in the DM line for households. The major difference from the DM310 model is a reverse screw current.

When a solid fraction hits the edge of one of the auger blades, there is a sharp jump in the current consumption of the gear motor. DM320 has a high-precision current sensor that measures the current consumption of the gear motor 5 times per second and starts the reverse procedure when the threshold value is exceeded. Because of the reverse, the solid fraction falls off the edge, the screw wedges and the gear motor does not fail because of overheating. The screw reverse function ensures that the boiler will not stop because of a small stone that caused the screw to jam while the owner was driving away.