When both the ventilation fan and the overhead lights on a kitchen range hood fail simultaneously, the malfunction usually points to a universal power interruption rather than isolated component failures. The most frequent causes include a tripped household circuit breaker supplying the kitchen, a loose power cord or disconnected plug behind the upper chimney flue, a blown internal thermal fuse triggered by excessive cooktop heat, or a failed master power switch. You can troubleshoot power failures safely using a digital multimeter set to voltage. You can verify that your corrective action is successful when resetting the tripped circuit breaker, plugging the power cord in securely, or replacing a blown thermal fuse restores full electrical power, lighting, and fan operation to the range hood.
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