Diagnosis
Yeah, this one's common. The heating element isn't engaging. Most likely, the internal thermal fuse has blown, which is a one-time safety device that trips if the unit overheats.
How to Fix It
You'll need to open the case. Unplug it, then remove the screws (usually under the rubber feet and a rear panel) to get to the internal components. Locate the thermal fuse—it's a small, white ceramic cylinder with two wires, attached to the heating assembly. Test it for continuity with a multimeter. If it's blown (no continuity), you need an exact replacement, typically a 250V 10A 154°C/309°F fuse. Solder the new one in place.
If That Didn't Work
If the fuse is fine, the issue could be the main heating element itself or the relay on the control board that sends power to it. You'd need to test those with a multimeter next.
Heads Up
Be super careful reassembling. Make sure no wires are pinched near the heating element or fan. A bad reassembly job can create a new overheating hazard.