Garage door reverses to open position during closing; opener lights flash 2 times, pause, then 1 time (logic board LED code 2-1).

Safety first: Keep people and objects clear of the door while adjusting travel. Use a stable ladder to reach the opener head.

Steps to fix:

• Identify travel controls: On most Chamberlain belt/chain drive openers, there are UP and DOWN travel adjustment buttons or dials on the side or back of the motor unit.
• Reset travel (if equipped with automatic setup): Press and hold the UP travel button until the door reaches the fully open position, then press the DOWN travel button to set the closed position, following the specific instructions in the Chamberlain manual for your model.
• Increase down travel: If the door stops above the floor and reverses, increase the DOWN travel in small increments (1/4 turn or one button press at a time) until the door closes firmly against the floor without excessive force.
• Check for obstructions: Ensure nothing is blocking the door path or binding the rollers, as this can cause the opener to think it has reached the floor early.
• Run a full cycle test: Open and close the door several times to confirm smooth travel and that the 2-1 code no longer appears.