What happens to the Firechief® Kitchen Stove Guard if there is a power cut?

The system just needs to be reset

In the event of the power being cut off in a fire hazard situation or as a result of a power cut, the cooker can be reactivated simply by pressing the reset button on the sensor.

You can find out more about the Firechief® Kitchen Stove Guard here or watch videos on how to use it here.