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If the dryer runs but it doesn't heat, the first thing you want to do is test power at the junction block on the back of the dryer where the power cord connects to the back of the dryer itself. Make sure you have 220 volts between the 2 outside power wire terminals. The dryer will run but it will not heat with only 110 volts.
Other than that, the dryer would need to be taken apart to access the heating element below the dryer drum. You'd need to unplug the dryer, remove the angled panel below the door, remove the top sheet metal panel, and then remove the the control panel and sheet metal panel so you can access the belt around the drum. Disconnect the belt and remove the drum and you finally have access to the heater. Use a multimeter to test continuity through the element and the fuses/thermostats mounted to the side of the element. If any of them have no continuity, you need to replace it.
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