Why can't Siemens dryers dry a load of laundry?

Can't sense moisture and stop working. According to Siemens dryer instructions query can be known, Siemens dryer only put a piece of clothing will appear to sense the moisture and stop working, Siemens dryer energy-saving design, will automatically sense the moisture in the cabin, cabin moisture is too low will stop working. Siemens is a brand created by Siemens AG of Germany, founded in 1847, is a global leader in electrical and electronic engineering, entered China in 1872, is a technology company focused on industry, infrastructure, transportation and health care.