User manual CHAMBERLAIN 801C INSTALLATION

[. . . ] Be sure power is not connected to the garage door opener BEFORE installing the safety reversing sensor. [. . . ] If the indicator light is off in the receiving eye and the invisible light beam between the sensors is not obstructed, alignment is required. Loosen the receiving sensor wing nut to allow slight rotation of safety sensor. If the sending eye indicator light does not glow steadily after installation, check for: · If sending eye indicator light glows steadily but receiving eye indicator light does not: · See instructions on next page or in your owners manual. Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. ⷠIf one control (force or travel limits) is adjusted, the other control may also need adjustment. ⷠAfter ANY adjustments are made, the safety reversal system MUST be tested. The garage door opener will not close from a remote if the indicator light in either sensor (A) is off (alerting you to the fact that the sensor is misaligned or obstructed). If the opener closes the door when the safety reversing sensor is obstructed (and the sensors are no more than 6" (15 cm) above the floor), call for a trained door systems technician. [. . . ] ⷠIf the unit continues to fail the Safety Reverse Test, call for a trained door systems technician. [. . . ]