Abstract: A fire-preventing warning system for alerting an occupant leaving the premises that a stove burner is on, includes (a) a sensor to detect whether a gas or electric stove is "on", connected to (b) a warning indicator located by the exit door. If the stove burner is on, the warning indicator will light up, or, in the alternative, emit an audible warning, or both, as the door is opened. The sensor and the indicator circuitry may be connected by electrical conductors or by radio frequency transmission; the system may be battery-operated or powered from household current.