First, unplug the dryer and access the heating element assembly. Visually inspect for damage, then use a multimeter set to continuity to test the element. If there's no continuity, a replacement is necessary.

. While some DIYers splice broken coils as a temporary fix, this is unsafe and short-lived—replace the element for a reliable, lasting solution

Start with safe diagnostics: check the door switches and try resetting the control board by unplugging for a minute. 

If those don’t resolve it, the problem might lie with the magnetron, high-voltage diode, thermal fuse, or control board. A trained technician should inspect and replace these parts—DIY repairs can be dangerous due to high-voltage components