Check the circuit breakers. I remember once something like this happened and it turned out that there were two lines grouped together and only one tripped causing this problem.

The heating element assembly warms the air before it enters the dryer drum. Over time, the heating element can burn out, causing the dryer not to heat. To determine if the heating element assembly has burned out, use a multimeter to test it for continuity. If the heating element assembly does not have continuity, replace it. · Heating Element Assembly for your Dryer · Heating Element Assembly - Part # 2438 Mfg Part # 279838 · RepairClinic Item #2438 · Dryer heating element. If your dryer does not heat first check for a blown thermal fuse on the blower housing before replacing the heating element. In most cases the heating element will have a break in the element if defective. · The thermal fuse is a safety device designed to protect the dryer from overheating. The fuse is located on the blower housing or at the dryer’s heat source such as the heating element on electric dryers or at the burner on gas models. The fuse should be closed for continuity meaning it has a continuous electrical path through it when good. If overheated the fuse will have no continuity meaning the electrical path is broken and the fuse has blown out. A multimeter can be used to test it for continuity. Be aware that a blown thermal fuse is an indication of a restricted exhaust vent from the dryer to the outside. Always check the dryer venting when replacing a blown thermal fuse. · High Limit Thermostat for your Dryer · High Limit Thermostat - Part # 898078 Mfg Part # 3977767 · RepairClinic Item #898078 · Dryer high-limit thermostat, L250-80, with terminal extension arm. This thermostat should be closed for continuity at room temperature and opens at around 250 degrees Fahrenheit. If the dryer won't heat, the high-limit thermostat might be defective.