Troubleshooting a malfunctioning Craftsman garage door opener involves a systematic check of common failure points. First, inspect the safety reversing sensors (photo-eyes) near the floor to ensure alignment and clean lenses. Second, check the power supply by verifying that the unit is plugged into a live outlet and that the circuit breaker has not tripped. Third, check for error blink codes on the motor diagnostic LED. Callout type="warning" title="Electrical Safety Warning": Unplug the unit or turn off power before inspecting internal components. Verification: Test the door using both the wall button and handheld remotes to confirm normal operation.
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