Kenmore defrosting too long

Is there a way to shorten defrost time on this refrigerator? The ice in the bin melts enough to stick together when refrigeration comes back on. No timer. It has a control board. Is there a jumper or something that I could change to shorten the length? Where might I find a resistance values chart for the defrost sensor?

Ok, I just saw that it has a defrost sensor and not a thermostat. Where can I find the resistance values for this sensor?