There are two components in the voltage supply line to the dryer that could prevent the dryer from running. The belt switch could be open due to a broken drive belt. The other component that could prevent the dryer from running would be a blown thermal fuse. You can check these two components by
unplugging the dryer
and removing the bottom front service panel as shown in the first image below.
With the toe panel off, you can check to see whether the drive belt is broken. If it is, then you can order a replacement from the
website. The part number is 661570.
If the drive belt is okay, then you can check the thermal fuse for continuity. The location of the thermal fuse on the blower housing is illustrated in the second image below. To check this fuse (with the dryer still unplugged), pull one wire off of the fuse and measure the resistance across the leads of the fuse with a volt/ohm meter. You should measure near zero ohms of resistance (continuity) if the fuse is good. If you measure infinite resistance (open), then the fuse is blown and will need to be replaced. The part number for the thermal fuse is 3390719.
NOTE: If the thermal fuse was blown, check the exhaust vent air flow through your dryer. Clean the lint screen. Wash the lint screen with water and thoroughly dry it if you use dryer softener sheets. Check the flexible vent behind your dryer for kinks or clogs. Check the exhaust vent duct to the outside of your home for restrictions. You may need to have a cleaning service clear this duct.
If both of these components are okay, you could also have a failed drive motor, a bad electronic control board or a wiring failure between components.
If you need more help, resubmit your question with additional details.