When a kitchen range hood suddenly loses all power and fails to operate its lights or fan, the malfunction is typically caused by a tripped household circuit breaker, a loose power cord plug behind the upper chimney flue, a blown internal thermal fuse due to 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 and operational readiness to the range hood.
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