There may be different reasons why your heater has shut down. See below for some things to check:
Be sure it is plugged in and that the electrical outlet is working.
Check for any obstructions. If you find an obstruction, turn the heater OFF and unplug it.
Allow the heater to cool completely, then remove the obstruction. Wait at least 10 minutes, then re-plug the heater in.
Check your Thermostat Control setting. The unit may simply be off because you have reached your desired heat setting.
One of your safety features may have been activated. Read your Owner’s Manual to see which safety features your device is equipped with.